Ixyouvrs.} 
Grnus 7.—RenomwRa—Brown. 
Shell multilocular, the volutions mutually involving the axis ; 
the opening at the point of the superior chamber. 
1. R. oblonaa, pl. LVI, f. 16-17.—First Ed., pl. 1, f. 16-17. 
Shell oblongz-ovate, kidney shaped, with six compartments, the three superior in- 
vesting the inferior ones; colour bluish white, very transparent and glossy. Length 
one line. Found at Tenby, Wales, by George Lyons, Esq. 
Genus 8.—Mitiota—Lamarck. 
Shell multilocular, transverse, ovate-globular, or elongated, with 
transverse cells surrounding the axis, and alternately surmounting 
each other; aperture very small, orbicular or oblong, situated at 
the base of the last volution. 
1. M concentrica, pl.-LVI, f. 22.—First Ed., pl. 1, f. 22. 
Shell consisting of four small, oblong, central, double semilunar compartments, 
invested by two large ones; smooth, shininz, and of a cream white colour; size 
about a line. Found at Dunbar by General Bingham. 
Genus 9.—Lacena.— Walker. 
Shell unilocular, flask-shaped and free. 
1. L. perlucida, pl. LVI, f. 29.—First Ed., pl. 1, f. 29; Vermiculum perlu- 
cidum ; Montagu, p. 525, pl. 14, f. 3. 
Shell flask-shaped, smooth, furnished with six equidistant, longitudinal ribs, and a 
small knob at the base; neck very long, subcylindrical, aperture extremely small ; 
colour white, transparent and glossy, sometimes brownish. Length not a tenth of 
aninch. Found at Seasalter. 
2. L. striata, p\. LVI, f. 36.—First Ed., pl. 1, f. 36; Walker, f.6; Vermiculum 
striatum ; Montagu, p. 523. 
Shell suboval, with a slender produced neck; body longitudinally and conspicu- 
ously striated, beg more opaque than the rest of the shell; shaped like a Florence 
flask ; aperture small, orbicular. Length not half a line. A rare shell, found at 
Sandwich, Reculver, Shepey, and on the south coast of Devonshire. 
3. L. squamosa, pl. LVI, f. 32.—First Ed., pl. 1, f. 32; Vermiculum squa- 
mosum ; Montagu, p. 526, pl. 14, f. 2. 
Shell subglohose, marked with undulated scale-like strie; aperture a little pro- 
duced. A minute species from Seasalter. 
4, L. marginata, pl. LVI, f. 30-31.—First Ed., pl. 1, f. 30-31 ; Walker, f. 7; 
Vermiculum marginatum ; Montagu, p. 524. 
Siell somewhat flask-shaped, its centre invested by a rib, subdividing the body ; 
colour white, transparent and glossy. From Reculver; very rare. 
5. L. urna, pl. LVI, f. 33.—First Ed., pl. 1, f. 33; Vermiculum urne ; Mon- 
tagu, p. 525, pl. 14, f. 1. 
Shell urn-shaped, smooth, glossy, semi-transparent and white; at the base there 
is a slender appendage, or knob; superior extremity produced into a conic neck, in 
which is situated the aperture. Length not quite a line. Found in sand at Shepey 
Island. 
6. L. retorta, pl. LVI, f. 34-35.—First Ed., pl. 1, f. 34-85; Serpula retorta ; 
Walker, f. 10; Vermiculum retortum ; Montagu, p.°524. 
Shell suborbicular, retort-shaped, white, opaque; centre of the body and outer edge 
of the neck invested Ly a strong longitudinal rib; mouth subcylindrical and recurved, 
with a small subumbilicus at the base of the neck. Diameter not halfaline. Found 
at Sandwich. 
ORDER Il—TRACHELIPODA. 
Posterior part of the body spirally convolute, separated from the 
feet, and constantly enveloped in a shell; foot free, depressed, at- 
tached to the lower base of the neck, on the anterior part of the 
body, and forming a member of locomotion; shell spiral and envel- 
oping. 
Section ].—Zoopuacous TRACHELIPODA. 
The animals are entirely marine, having a protruding syphon, 
and respiring water only, which reaches the branchiz by this sy- 
phon; they are devoid of maxilla; provided with a retractile pro- 
boseis; and feed on other animals. Shell spiral, enveloping, with 
the aperture canaliculate, notched or effuse at its base. 
Famity I.—Invo.ure. 
Shell destitute of a canal, but having its aperture notched or 
MOLLUSCA. 3 
effuse at the base, and its volutions compressed, and convoluted in 
such @ manner as the external one nearly envelopes the others. 
Genus I.—Cyer2ea.—Linneus. 
Shell ovate, or oblong-ovate, convex; margins involute; aperture 
longitudinal, narrow, dentated on both sides, effuse at the extremities ; 
spire very small, generally concealed in the mature shells. 
1. C. Europea, pl. Il, f. 8-12.—First Ed., pl. 44, f. 8-12; Cyprea pediculus ; 
Montazu, p. 200, Donovan, II, pl. 43. 
Shell oval, glossy, tumid on the back, surrounded with transverse elevated striae, 
which terminate within the lips, giving them the appearance of being crenulated ; 
the surrounding stri# in some places divided by interinediate shorter ones, or in some 
instances they are bifurcated; colour pale purplish brown, or skin colour, with three 
dark, blackish brown spots on the ridge of the back; the middle one often very 
faintly marked; face of the shell, in which the lips are situate, white, or very pale 
flesh colour. Common on many of the shores of Britain and Ireland. 
This species, like the whole of the Genus, is very dissimilar in its young and adult 
state, and has in consequence been described in those conditions as distinct species. 
Fig. 6, pl 2, is the shell in its early state, the Bulla diaphana of Montagu, p. 225, 
pl. 7, f. 8; and f. 10 is the same in a more advanced condition; the Cyprea bullata 
of Montagu, p. 202, pl. G, f. 1. In both these stages it is entirely devoid of striw, 
being diaphanous, glossy and thin. 
Montagu describes the variety of this species, which is destitute of spots, as the 
C. Arctica. Authors have also confounded it with the C. pediculus of Linnzus, 
from which it is at once distinguished, being devoid of the dorsal suleus. 
Genus 2.—Ovu.a.— Bruguiere. 
Shell turgid, attenuated at both ends; margins convolute; aperture 
longitudinal, narrow, effuse at the extremities; the left margin 
without teeth. 
1. Ovula patula, pl. I, f. 11-13.—First Ed., pl. 44, f. 11-13; Bulla patula ; 
British Zoology, pl. 70, f. 85, A; Montagu, p. 207. 
Shell smooth, glossy; pale fawn, or cream white; oblong, involuted, upper end 
extending beyond the body, base more produced; aperture large, terminating in a 
short canal at each end, most contracted at the top; columella twisted, and ending 
in an oblong subumbilicus on the pillar lip; outer lip plain, and very thin. 
and one-tenth of an inch, breadth one inch, Found at Weymouth. 
Length one 
Famity II.—Co.tumecvania. 
Destitute of a canal at the base of the aperture, but with a sub- 
dorsal notch, more or less distinct, and folds upon the columella. 
Genus 3.—Votvaria.—Lamarch. 
Shell cylindrical, convolute; the spire hardly protruding; aper- 
ture narrow, nearly the whole length of the shell; columella with 
one or more folds near its base. 
1. V. cylindrica, pl. X1X, f.36-37.—First Ed., pl. 38, f. 36-37; V. pailida ; La- 
marek, 7, p. 353; Bulla cylindrica, Pulteney, p. 40; B. cylindracea, Montagu, 
p- 221, pl. 7, f. 2; Pennant, pl. 70, f. 85; Donovan, IV, pl. 120, f. 2. 2. 
Sheil slender, cylindric, smooth, glossy and white; aperture extending its whole 
length, very narrow and somewhat dilated at the base ; outer lip thin, acute, straight - 
inner lip thickened, opaque and white; columella somewhat indented. Length five- 
eighths of an inch, breadth two-eighths. Inhabits the sea at Falmouth, Teignmoutn, 
and Dawlish, South Devonshire, Beddleford Bay in the north, and on the Caernar- 
vonshire coast, Tyne sands, Frith of Forth, and Portmarnock, Ireland. 
2. V. subcylindrica, pl. XIX, f. 19-20.—First Ed., pl. 38, f. 19-20. 
Sheil subcylindrie, oblong-ovate, smooth, white; aperture umbilicated, the whole 
length of the shell, compressed, widening a little towards the base, outer lip rising 
a little above the apex; pillar lip slightly reflected at the base, forming a subum- 
bilicus. Length one-eighth of an inch, breadth half its length. Discovered at 
Dunbar by General Bingham. 
3. V. umbilicata, pl. X1X, f. 9.—First Ed., pl. 38, f. 9; Bulla umbilicata ; 
Montagu, p. 222, pl. 7, f. 4. 
Shell oblong-oval, smooth, and white; apex rounded and strongly umbilicated , 
aperture the whole length of the shell, very narrow, dilating a little at the base. 
Length an eighth of an inch, breadth about half its length. Found in sand at Fal- 
mouth harbour. 
4. V. alba, pl. XIX, f. 43-44.—First Ed, pl. 38, f. 43-44, 
Shell subcylindrical, bulging in the centre, thin, smooth, glossy and white ; aperture 
the whole length of the she!l, a little compressed in the centre, and dilated towards 
the base; outer lip thin, pillar lip thickened at the base, with a very slight dupli- 
cature at the bottom of the columella; no visible spire, but its apex slightly subum- 
