BELEMNITIDiE : BELEMNITES. 
135 
22. Belemnites exilis. * 
Shell very long, subulate, slender, compressed, one-ribbed on the 
sides, posteriorly sharply acuminate ; aperture compressed, 
rather square, angular ; alveolus at an angle of 20°. 
Belemnites exilis D' Orb. Paleont. Frang. Terr. Jur. i. 101. t. 15. 
f. 6 — 12. 1842, Paleont. univ . t. 41. f. 6 — 12., Moll. Viv . et Fos. 
i. 493., Belemn. n. 9. 
Hab. Upper Lias, very rare. 
23. Belemnites Tessoniantjs. 
Shell elongate, slender, posteriorly obtuse, anteriorly dilated, above 
with two grooves, underneath with three grooves; alveolus 
oblique, at an angle of 27°. 
Belemnites Tessonianus D' Orb. Paleont. Frang. Terr. Jur. i. 103. 
t. 11. f. 13—18. 1842, Paleont. univ. t. 41. f. 13—18., Moll. Viv. 
et Fos. i. 494., Belemn. n. 10. 
Hab. Upper Lias, not common. 
** Ventral Groove distinct. — Gastrocoeli IP Orb. 1. c. i. 481.; 
Bronn , Gesch. der Naturg. iii. 150. Notosi phites Duval , 
Belem . 23. 29. 38. ; see D' Orb. Moll. Viv. et Fos. i. 466. 
f Style elongate , lanceolate, or conical , with a ventral Groove 
extending the whole length below. Lateral Grooves none . — 
Fossils in Lower and Great Oolite. Canaliculati D'Orb. 
Moll . Viv. etFos. i. 481. ; Bronn , 1. c. 150. 
24. Belemnites canaliculatus. 
Shell elongate, depressed, cylindrical, posteriorly acuminately 
obtuse, beneath longitudinally grooved; groove not inter- 
rupted, equally impressed; aperture depressed, beneath sinu- 
ated ; alveolus at an angle of 25°. 
Belemnites canaliculatus Schloth. Petref. 49. n. 9. 1820; Hartm. 
Wurt. 16. ; Keferst. Diet. Nat. 425. n. 26.; Zieten, Wurt. 21. f. 
3. ; Roemer , Ool. 176. n. 26. ; D'Orb. Paleont . Frang. Terr. Jur. 
i. 109. t. 13. f. 1 — 5., Paleont. univ. t. 51. f. 5, 6., Moll. Viv. et 
Fos. i. 510., Belemn. n. 18. 
Hab. Lower Oolite. 
25. Belemnites sulcatus. 
Shell elongate, compressed anteriorly, depressed posteriorly, equal, 
apex obtusely mucronate, grooved beneath ; the groove disap- 
