2 
MOLLUSCA. 
[Cephalopoda. 
tapering to a point ; aperture coneisting of a small produced siphon ; colour, 
when divested of its brown epidermis, pure white and glossy. Length one- 
tenth of an inch. Inhabits the sea at Sandwich. 
2. If. decemloeiclaria. 
Shell with ten distinct, nearly globular articulations ; slightly arcuated, 
and ending in a long tapering articulation, in which the septa are hardly dis- 
tinguishable ; covered with a reddish-brown epidermis. Length a tenth and 
a half of an inch. We have received this from the south coast of Devon ; but 
too late for insertion in the plate. 
This is doubtless the same shell which Montagu considers a variety of 
If. subarcmta, which he had from Sandwich. 
3. If . radieula, -pi. I, f. 28. — Orthocera radicula. — First Ed., pi. 52, f. 28 ,* 
Nautilus radicula ; Montagu, p. 197, pi. 6, f. 4. 
Shell subconic, elongated, with six subglobose deeply divided articulations ; 
the upper one much larger than the others, and egg-shaped, smooth, opaque- 
brown, and the aperture provided with a small siphon, with the apex extended 
to a conic point. From Sandwich. 
Montagu mentions varieties of this species, having from two to live articu- 
lations. We have not seen these, and therefore cannot speak concerning 
them. The following distinct species is oiily considered a variety by that 
able naturalist. 
4. N. ootolocularia, pi. I, f. 25. — Orthocera radicula. — First Ed., pi. 52, f. 25 ; 
Nautilus radicula ; variety. Montagu, 198, pi. 14, f. 6. 
Shell with eight round sub-compressed articulations, the superior one 
noarl^-^ spherical, with a small circular aperture in the apex; the remaining 
articulations gradually lessening, and the last one somewhat ]jyriform and 
pointed at its extremity. Colour cream white. Found at Sandwich and the 
south coast of Devon. 
In our first edition we followed Montagu, in considering this only a variety 
of N radicula. 
5. N spinulosa, pi. I, f. 26. — Orthocera spinulosa. — First Ed., pi. 52, f. 26; 
Nautilus spinulosus ; Montagu, Sup. p. 86, pi. 19, f. 5. 
Shell with three globose, deeply divided articulations, covered with spines, 
which incline to the posterior end ; the superior bulb somewhat elongated, in 
the form of a siphon ; colour pale chestnut. 
Montagu mentions a variety of this shell, of which he possessed a drawing 
by IMr. Henry Boys, which was subarcuated and taper ^vith eight articula- 
lations ; which were rather tuberculated than spined. We would be inclined 
to consider this a distinct species, under the trivial name of iuherculata. 
Genus 4. — Obthocera. — Lamarch. ' 
Shell elongated, straight, or a little arcuated, suhconical ; gene- 
rally ribbed, with longitudinal, external grooves ; chambers formed 
by transverse septa, perforated by a tube, which is either central or 
marginal. 
Subdivision I. — Ribbed. 
1. 0. costata, pi. I, f. 17. — First Ed., pi. 52, f. 17 ; Nautilus costaUis ; Mon- 
tagu, p. 199, pi. 14, f. 5. 
Shell straight, subcylindrical, tapering slightly towards the posterior ter- 
.mination; with twelve convex articulations, each provided with tour equi- 
distant. strong longitudinal ribs, running continuous!}'- the whole length of 
the shell ; aperture extended, in the form of a short conic siphon. Length a 
quarter of an inch. Found on the coast of Kent. 
Montagu mentions a variety, with only six articulations, for the same 
locality. 
2. 0. septemcostata, pi. I, f. 24. — 0. eostata, variety. First Ed., pi. 52, f. 24; 
Nautilus costatus; Montagu, Sup. variety, p. 83, pi. 19, f. 2. 
Shell nemiy cylindrical, with five oblong-ovate articulations, each pro- 
vided with seven ribs, running continuously the xyhole length of the shell ; 
posterior end truncated, with the points ot the ribs projecting beyond its 
margin ; anterior end terminated by a slender cylindrical process as long as 
the first articulation, destitute of any opening, the aperture being situated at 
the truncated extremity. 
Montagu mentions a variety with five articulations, and four ribs only. 
3. O.jugosa, pi. I, f. 13. — First Ed., pi. 52, f. 13; Montagu, j). 198, pi. 14, 
f. 4. 
Shell subarcuated, subcylindrical, tapering ; with nine, ridged, subglobose, 
somewhat elongated articulations ; aperture extended to a small conic siphon, 
the extreme joint at the inlerior end rather longer than the contiguous ones ; 
colour opaque-brown. Length a little more than an eighth of an inch. The 
ridges do not extend quite to the top of the articulations. 
4. 0 bicarinata. —Naiitilus bicarinatus. — Montagu, Sup. p 86. 
Shell arcuated, subcylindrical ; with eleven subglobose, bicarinated articu- 
lations, or furnished with a slight longitudinal rib along the arc, and another 
on the opposite side ; the larger end terminated by a produced siphon ; the 
articulations gradually decrease towards the posterior end, which is rounded ; 
lenath an eighth of an inch ; diameter at the largest part about the same. 
Found at Sandwich. 
5. 0. linearis, jfi. I, f. 14-15. — First Ed., pi. 62, f. 14-15 ; Nautilus linearis ; 
Montagu, Sup. p. 87, pi. 30, f. 9. 
Shell straight, a little compressed, linear, slightly tapering ; provided with 
numerous longitudinal ribs, which take an oblique direction, and scarcely 
extend half the length of the shell. It is of a glossy, smooth, and pellucid 
white, e.xcept along the sides, and at the divisions of the cells, where it is 
opaque ; there are about fourteen slightly oblique, and not quite regular 
septa ; anterior extremity smooth, and terminating by a produced siphon ; 
posterior end rounded. Length nearly a quarter of an inch, breadth about 
an eighth of its length. Found on the shell-bank at Dunbar, Frith of Forth. 
Subdivision II. — Destitute of Ribs. 
6. 0. recta, pi. I, f. 16, 19, 20 — First Ed., pi. 52, f. 16, 19, 20; Montagu, 
p. 197, and Sup. p. 82, pi. 19, f. 4 and 7. 
Shell straight or very slightly arcuated, with perfectly smooth, slightly 
divided articulations ; tapering a little to the posterior termination ; aperture 
situated in a small produced siphon at the anterior extremity. Found at 
Sandwich; very rare. 
Family IY. — Spherulacea. 
Shell globular, spheroidal, or oval ; with the volutions mutually 
enveloping, or the cells contiguous, and forming a tunic. 
Genus 5 — Biloculina. — D'Orhigny 
Shell ovate-globose, wdth two transverse cells, involving the axis 
1. B. oblonga, pi. LVI, f. 38-39. — Lagena oblonga. — First Ed., pi. I, f. 38-39; 
Venniculum oblongum; Montagu, p. 522. pi. 14, f. 9. 
Shell oblong, oval, somewhat compressed ; with a longitudinal suture on one 
side, which divides the shell into two parts ; on the opposite side the middle 
compartment is surrounded by a faint depression, which separates it from the 
exterior one, and is more elevated, aperture oval, slightly produced, with a 
yellow margin ; general colour opaque, glossy white. Length not half a line. 
Found in sand from Salcomb Bay, Devonshire ; rare. 
2. B. elliptica, pi LYl, f. 23. — Miliola elliptica. — First Ed., pi. I, f. 23. 
Shell ellipticiil, a little compressed, clear, smooth and glossy ; the internal 
chambers shining through, giving it the appearance ol being externally 
grooved ; size not a lino. Found at Dunbar by General Bingham, 
3. B. lactea,p\. LVI, f. 28. — Miliola lactea. — First Ed. ; Vermiculumlacteuni ; 
Montagu, p. 6i2 ; Scrpula tenuis ; Walker, f. 5. 
Shell thin, smooth, glossy, egg-shaped, slightly compressed ; pellucid, 
with milk-white veins, l.ongth hall a line. Coast of Devonshire. 
4. B. marginata, pi. LVI, f. 25. — Renoidea marginata . — First Ed., pi. I, 
f. 25 Yermiculum marginatum ; Montagu, p. 524; Walker, pi. I, f. 7. 
Shell globular, a little compressed, surrounded by an elevated zone; colour 
white, transparent and glossy. Size not halt a lino. Found at lieculver, 
and on the coast of Devon ; very rare. 
Genus 6 — Tuiloculina. — D'Orhigny. 
Shell generally ovate-globose, with three transverse cells involv- 
ing the axis. 
1. T. glabra, pi. LVI, f. 20-21. — Renoidea glabra. — First Ed., pi. I, f. 20-21. 
Shell nearly circular, three lobed, the two external ones longest, and in- 
volving the third; smooth, transparent and glossy. Size about a niio. Fouud 
at Dunbar by General Bingham ; rare. 
2. T. rotundata, pi. LVI, f. I'i-lb.— Renoidea rotundata. — First Ed., jfi. 1, 
f. 14-15. 
Shell perfectly globular, smooth, shining and transparent ; milky white, 
with three lobes, the external ones largest. Size not a line. Found at 
Dunbar by General Bingham ; very rare. . 
3. T. bicornis, pi. LVf, f. 24. — Miliolia ifeomfs.— First Ed. pi. 1, f. 24. 
Serpida bicornis ; Slontagu p. 519. 
Shell throe chambered, the middle one small, the outer ones rounded, con- 
siderably larger, and investing it on one side, and longitudinally striated on 
the longer side from the aperture, which is contracted; mouth small, orbicular; 
colour opaque ; white. Length one line. Found at Sandwich and Keculver. 
4. T. perforata, pi. LVI, f. 'IQ.— Miliola p)erforata.—Yixat Ed. pi. 1, f. 26. — 
Vermiculum perforattim ; Alontagu, p. 619. — Scrpula bicornis ; Walker, f. 3. 
Shell throe chambered; central compartment fiat, thin, and perforated, 
with a semilunar disc on one side, and a larger curved chamber on the other; 
colour white, opaque, and glossy. Found at Sandwich and Cornwall ; very 
rare. 
5. T. striata, pi. LVI, f. 21.— Miliola striata.— Yirai Ed. pi. 1, f. 27. 
Shell with three compartments, the two outer ones investing the others ; 
the whole are longitudinally striated ; yellowish white ; not a lino in length. 
Found at Belton sands, near Dunbar, by General Bingham. 
6. T. minula, pi. LVI, f. 18-19.— minuta. — First Ed. pi. 1, f. 18-19. 
‘ Shell three chambered, the middle one flat on one side, and raised on the 
other ; it is entirely invested by the outer valves, one of which is slender, 
and the other broad, and tapering, with three or four strongly marked 
longitudinal strias; size about hall a line. Found at Dunbar by General 
Bingham. 
