* 
CLASS FIRST. 
UNIVALVE TESTACEOUS MOLLUSC A. 
Order I. —CEPHALOPODA. 
Head of the animal emanating from a bag-shaped 
mantle, and surrounded by inarticulated arms, provided 
with a sucker, and investing the mouth ; two sessile 
eyes; mouth furnished with two horny mandibles; pro¬ 
vided with three hearts; the sexes in different indivi¬ 
duals. 
Division I.— Cephalopoda Polytiialama. 
Shell multilocular, partly or entirely internal, and 
placed in the posterior part of the body. 
In the arrangement of Lamarck, this is the third 
division of the Cephalopoda. The first embraces the 
Sepia , or Cuttle Fish, which does not properly rank with 
the Testaceous Mollusca, and the second the Argonauta, 
or Paper Nautilus, of which genus no fossil species have 
yet been discovered. 
Family 1.—Nautilacea. 
Shell discoid, spiral, multilocular, with simple parti¬ 
tions; volutions contiguous, the last or the body one 
enveloping the rest; the septa transverse, and externally 
concave, perforated in the disk; margins entire. 
Genus I.—BACULITES.— Lamarck. 
Univalve, straight, lanceolate, part of which is inter¬ 
nally divided by septa, or partitions, withsinuated edges; 
the septa are penetrated by a siphuncle near their anterior 
margins. 
1. B. Faujasii.—F auja’s Baculite, pi. I. fig. 1. 
Lamarck An-San Vert, VII. p. G47 ; Sowerby, Mineral 
Conchology, VI. p. 186, pi. 592, fig. 1 ; Fauja’s Hist. Nat. 
de la Mont, de St Pierre, p. 140, pi. 21. fig. 2, 3. Brown 
in Popular Encyclopaedia, V. p. 335, pi. 65. fig. 1. Brown’s 
Elements of Fossil Conchology, pi. II. fig. 1. 
Smooth, both edges equally rounded, and the sides slightly 
compressed. 
Found in the chalk at Norwich, by C. B. Rose, Esq. and 
has occurred also at Hamsey. 
2. B. Obliquatus.—T he Oblique Baculite, pi. I. fig. 6. 
Sowerby, VI. p. 186, pi. 592. fig. 2, 3 ; Iiamites baca- 
loidcs , Mantell, Geology of Sussex, p. 123, pi. 23. fig. 6, 7. 
Do. Geology South East of England, pi. 160. fig. 1. 
With a very obliquely undulated and annular surface ; the 
annulations deepest at the margins, or at that place where 
the siphuncie is situate. 
Fig. 7 represents a rare variety, wherein the aperture is 
placed obliquely ; each side is provided with a large oval 
reflected lobe. The aperture is marked by a , and the situation 
of the siphuncie by S. 
This species is very common in the Gray Chalk Marie of 
Lewes, and abundant at Ilamsey. Mr Mantell remarks, that 
“ this species may easily be recognized by its extraordinary 
length, by the smoothness of its surface, and the great obli¬ 
quity of the few undulations with which it is ornamented. 
Fragments from one to six inches in length, and about 0.4 
inch in diameter, marked with oblique undulations, and occa¬ 
sionally exhibiting foliaceous septa, are very abundant in 
every locality of the Gray Marl near Lewes.” 
All the species, whether Foreign or British, which have 
yet been discovered, occur in the lower beds of Chalk or 
Chalk Marie, and in the upper Green sand. 
Genus II.—IIAMITES.— Parkinson. 
Shell fusiform ; hooked or bent into two parallel limbs ; 
chambered ,* septa undulated at their margins, with a 
siphuncie at their outer edge. 
1. II. gig as. —The Giant Hamite, pi. I. fig. 13. 
Sowerby, Min. Conch. VI. p. 188, pi. 593, fig. 2. 
Abruptly curved, with large, transverse, nodulous, oblique 
ribs, the tubercles on each being generally six, which are 
laterally expanded ; on both sides are three obtuse spines, 
united to form each rib, which becomes almost obsolete as 
it passes over the front; the larger spines arc placed near the 
front: section, hexagonal, protruding in front, with the sides 
and back concave. Size, from aperture to the extreme edge 
of the curve, 6j inches ; greatest thickness, inches. 
Found by G. E. Smith, Esq. in the second or lower bed of 
limestone, in its uppermost course of Rag and Clay, near 
Seabrooke, between Sandgate and Ilythe, and on the Roughs, 
west of Hythe. 
2. II. giiandis. —The Great Hamite, pi. I. fig. 9. 
Sowerby, Min. Conch. VI. p. 187? pi* £93, fig. L 
Surface, with numerous shallow oblique undulations in 
front; each side provided with a few short oblique ribs, 
which arc largest at their extremities; between each rib arc 
six somewhat produced, rounded furrows, reaching to the 
liue beneath which the siphuncie is situate ; posterior surface 
smooth; margins of the septa formed into six extremely acute, 
numerous, and complex sinuses, arranged into six very unequal 
lobes ; section sub-rotund. 
Found in the parish of Smeeth, near Ilythe, on the estate 
of E. Hughes, Esq. in a quarry of Kentish Ragstone. 
3. II. PLicATiLis.—The Folded Hamite, pi. II. fig. 10. 
Sowerby, Min. Conch. III. p. 59, pi. 234, fig. 1. Mantell, 
Geology of Sussex, p. 121, pi. 23, fig. 1, 2. 
Shell somewhat compressed, with numerous, regular, an¬ 
nular, continuous, and undivided ridges ; each side provided 
with two rows of depressed equal tubercles, which extend 
over those of the annular ridges ; with two ridges between 
each tubercle ; curvature gradual. 
Found in the chalk marie at Bishopstrow, near Warminster 
4. II. undulatus. —The Waved Hamite, pi. II. fig. 1 L 
Iiamites armatus , Sowerby, Min. Conch. III. p. 59? pi* 234 
fig. 2. 
Depressed, with irregular transverse undulations ; two rows 
