S50 MOLLUSCA. CEPHALOPODA. Baculita. 



2. T. tuberculata — Whorls beset with one row of large obtusely conical tu- 

 bercles, and three rows of smaller tubercles below them Sower. Min. Conch. 



t. Ixxiv Chalk Marl. 



3. T. undulata — Whorls with many undulating ribs, mostly continuing 

 from the upper to the lower part of ekch..— 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. — Shell hooked or bent into two parallel 

 limbs ; syphon near the outer edge — Hamites of Parkin- 

 son and Sower by. 



* Without spines or tubercles. 



1 . B. compressa. — " Depressed, curved at right angles ; vmdulations sharp, 

 slightly waved, most prominent at the back — Soiver. Min. Conch, t. Ixii. f. 7- 

 8.— In Chalk Marl, Folkstone. 



2. B. temds 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 ; tapeiing — Soicer. Min. 

 Conch, t. Ixi. f. 1 In clay in the Chalk Marl, Folkstone. 



3. B. rohmda. — Aperture round, undulations obtuse, annular, numer- 

 ous ; the curve of the shell very gradual. — Sower. INIin. Conch, t. Ixi. f. 2, 3. 

 — Chalk Marl, Folkstone. 



4. B. attenuata. — Suddenly attenuated just below the cui"ve ; undulations 



obtuse, numerous. — Soiver. Min. Conch, t. Ixi. f. 4, 5 Mant, Suss. 93. t. xix. 



£ 29 Chalk Marl, Folkstone. 



5. B. maxima — " Slightly depressed ; undulations even, rounding, disap- 

 pearing at the back ; curvature gradual." (S.) — Parkinsmi's Organic Remains, 

 iii. p. I44. t. x. f. 4. Sower. Min. Conch, t. Ixii. f. i. — Chalk Marl, Folk- 

 stone. 



6. B. intermedia " Depressed, undulations obtuse, annular, waved, cur, 



vature rounding." (S) — Park. Org. Rem. iii. p. 143. t. x. f. 1, 2 — Soicer. 

 Min. Conch, t. Ixii. f. 2, 3, and 4, except the right hand figure. — In Chalk 

 Marl, Folkstone. 



7. B. gibbosa. — "} Gibbous, undulations acute, prominent at the fi'ont, ra- 

 ther distant." Very flat at the back — Sourer. Min. Conch, t. Ixii. f. 4. right 

 hand figure — Chalk Marl, Folkstone. 



8. B. Parkinsoni. — Curvature obtuse, annulations distinct. — Park. Org. 

 Rem. iii. p. 144. t. x. f. 5. — In Green Sand, Wiltshire. 



The Hamites adpressm of Sower. Min. Conch, t. Ixi. f. (i. " Aperture round, 

 lesser limb acute, jjressed close to the lai-ger ; no undulatit)ns ; septa? distant- 

 not waved," from Folkstone, is a shell still in obscurity. 



** WitJt sjnnes 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. i. 2. — In Chalk Marl, Oxfordshire and Sussex. 



