250 MOLLUSCA. CEPHALOPODA. Baculita. 
2. T. iulfercu^afa.-— Whorls beset with one row of large obtusely conical tu- 
bercles, and three rows of smaller tubercles below them. — S^otver. Min. Conch, 
t. Ixxiv. — C/ial/c Marl. 
3. T. wndulata . — Whorls with many undulating ribs, mostly continuing 
from the upper to the lower part of each. — Sower, Min. Conch, t, Ixxv. f. 1, 
2, 3.— Chalk Marl. 
Spires dextral. 
4. T. ohliqua . — Upper part of ths whorls contracted ; below the middle is 
placed a row of large oblique tubercles. — Sower. Min. Conch, t. Ixxv. f. 4, — 
In Green Sand. 
Gen.^ baculita. — S hell hooked or bent into two parallel 
limbs ; syphon near the outer edge — Hamites of Parkin- 
son and Sowerby. 
* Without spines or tubercles. 
1 . B. compressa . — ‘‘ Depressed, curved at right angles ; undulations sharp, 
slightly waved, most prominent at the back — Sower. Min. Conch, t. Ixii. f. 7- 
3. — In Chalk Marl^ Folkstone. 
2 . B. tenuis — Slender, depressed, undulation obtuse, slightly waved, dis- 
appearing on the back of the limbs. The undulations are irregular, some 
reaching nearly to the back, others only half way ; tapering — Sower. Min. 
Conch, t. Ixi. £ 1 — In clay in the Chalk Marl., Folkstone. 
3. B. rotunda. — Aperture round, undulations obtuse, annular, numer- 
ous ; the curve of the shell very gradual — Sower. Min. Conch, t. Ixi. f. 2, 3. 
— Chalk Marl., Folkstone. 
4. B. attenuata — Suddenly attenuated just below the curve ; undulations 
obtuse, numerous Sower. Min. Conch, t. Ixi. f. 4, 5 Mant, Suss. 93. t. xix. 
f. 29 . — Chalk Marl., Folkstone. 
5. B. maxima . — “ Slightly depressed ; undulations even, rounding, disap- 
pearing at the back ; curvature gradual.” Parkinson'' s Organic llem.ains, 
iii. p. 144. t. X. f. 4. Sower. Min. Conch, t. Ixii. f. i.’— Chalk Marl, Folk- 
stone. 
6. B. intermedia.'-,-'-^ Depressed, undulations obtuse, annular, v/aved, cur, 
vature rounding.” (S) — Park. Org, Bern. iii. p. 143. t. x. £ 1, 2 — Sower. 
Min. Conch, t. Ixii. £ 2, 3, and 4, except the right hand figure. — In Chalk 
Marl, Folkstone. 
7 . B. gihbosa. — Gibbous, undulations acute, prominent at the front, ra- 
ther distant.” Very flat at the back. — Sower. Min. Conch, t. Ixii. £ 4. right 
hand figure.— -C/ia/A; Marl, Folkstone. 
8. B. Parkinsoni . — Curvature obtuse, annulations distinct. — Park. Org. 
Bern. iii. p. 144. t. x. £ 5. — In Green Sand, Wiltshire. 
The Hamites adpressus of Sower. Min. Conch, t. Ixi. £ 6. “ Aperture round, 
lesser limb acute, pressed close to the larger ; no undulations ; septa? distant- 
not waved,” from Folkstone, is a shell still in obscurity. 
With spines or tubercles. 
9. B. armata.—'-'- Flatted ; undulations simple, every second or third arm- 
ed with a large thick spine on each side near the front.” — Sower. Min. Conch, 
t. clxviii. and t. ccxxxiv. £ 2 'In Chalk Marl, Oxfordshire and Sussex. 
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