250 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. lxxiv — Chalk Marl. 



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

 from the upper to the lower part of each.— Sower. Min. Conch, t, lxxv. f. 1, 

 2, 3 — Chalk Marl. 



** Spires dextral. 



4. T. obliqua. — Upper part of ths whorls contracted ; below the middle is 



placed a row of large oblique tubercles Sower. Min. Conch, t. lxxv. 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 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. lxii. f. 7> 



8. — 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. lxi. f. 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. — Soiver. Mill. Conch, t. lxi. f. 2, 3. 

 — Chalk Marl, Folkstone. 



4. B. attenuata. — Suddenly attenuated just below the curve ; undulations 



obtuse, numerous — Sower. Min. Conch, t. lxi. 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.) — Parkinson's Organic Remains, 

 iii. p. 144. t. x. f. 4. Sower. Min. Conch, t. lxii. 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 Sower. 



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

 Marl, Folkstone. 



7- B. gibbosa. — "j Gibbous, undulations acute, prominent at the front, ra- 

 ther distant." Very flat at the back. — Sower. Min. Conch, t. lxii. 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 adpressus of Sower. Min. Conch, t. lxi. f. 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. 



*K- 



Wiih spines or tubercles. 



0. B. armaia. — " Flatted ; undulations simple, every second or third arm- 

 ed with a large thick spine on each side near the front." — Soiver. Min. Conch. 

 t. clxviii. and t. ccxxxiv. f. 2 — In Chalk Marl, Oxfordshire and Sussex. 





