belemkitid^: 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'Orh. Paleont. Franq. 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. 



Hob. Upper Lias, very rare. 



23. Belemnites Tessonianus. 



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'Orh. Paleont. Franq. 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. 



Hah. Upper Lias, not common. 



** Ventral Groove distinct. — Gastrocoeli PfOrh. 1. c. i. 481.; 

 Bronn^ Gesch. der Naturg. iii. 150. Notosiphites Duval, 

 Belem. 23. 29. 38. ; see UOrb. 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 UOrb. 

 Moll. Viv. etPos.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. ; Kef erst. Diet. Nat. 425. n. 26.; Zieten, Wurt. 21. f. 

 3. ; Roemer, Ool. 176. n. 26. ; D'Orb. Paleont. Franq. 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. 



Hah. Lower Oolite. 



25. Belemnites sulcatus. 



Shell elongate, compressed anteriorly, depressed posteriorly, equal, 

 apex obtusely mucronate, grooved beneath ; the groove disap- 



