ONYCHOTEUTHID^ : ONYCHIA, OMMASTREPHES. 57 



Loligo Cardioptera Peron, Voy. Atlas, t. 60. f. 5. 1804 ; Blainv. 



Joum. de Phys. 123., Diet, des Sc. Nat. xxvii. 135. 

 Sepiola Cardioptera Le Sueur, Joum. Acad. Nat. Sc. PJiilad. ii. 



100. 1821. 

 Cranchia Cardioptera Feruss. Diet. Class. Atlas, t. 5. 1823; D'Orh. 



Tab. Meth. Ceph. 58. ; Feruss. et UOrh. Ceph. Acet. Cranchie, 



t. 1. f. 2, 3. cop. Peron; D'Orb. Voy. Am. Merid. Moll. 34. 

 Sepia Cardioptera Oken, Lehrh. des Zool. 343. n. 5. 

 Onychoteuthis Cardioptera UOrh. Moll, des Antilles, i. 53. n. 13. 



1838, Moll. Viv. et Fos. i. 389. 

 Onykia Caribasa LeSueur, Joum. Acad. Nat. Sc. Philad. ii. 98. t. 9. 



f. 1, 2. 1821. 

 Loligo Caribaea Blainv. Diet. Sc. Nat. xxvil. 139. 1823, Joum. de 



Phys. Ixxxvi. 127. ; Feruss. Diet. Class, iii. 67. Atlas, f. 4. 

 Onychoteuthis Cai'ibsea Feruss. Ceph. Acet. Onyth. t. 5. f. 4. 7. 



from LeSueur ; D' Orh. Tab. des Ceph. 60., Moll, des Antilles^ 



i. 57. n. 14. 

 Onychoteuthis Leachii Feruss. Ceph. Acet. Onych. t. 10. f. 1.4., 



shell represented as expanded at each end. 



Hab. Atlantic Ocean. 



** Fins dorsal. Cups of lateral Arms unequal. 



2. Onychia platyptera. 



Body cylindrical, smooth ; fins elongate, triangular, together 

 narrow lozenge-shaped. Sessile arms long, unequal ; in length, 

 3, 4, 2, 1 ; cups very unequal, especially of the lateral arms. 

 Tentacular arms short, not enlarged at the end ; basal group of 

 twenty-two cups half open, rest closed ; hooks twelve. Shell 

 broad, lanceolate ; apex with a conical, horny, compressed appen- 

 dix at the tip. 



Onych. platyptera D'Orb. Voy. Am. Merid. Moll 41. t. 3. f 8. 11. 



1835; nOrb. et Feruss. Ceph. Acet. Onych. t. 10. f 8-10. t. 14. 



f. 16-22. details; D'Orb. Moll. Viv. et Fos. i. 393. t. 26. f. 13. 

 Onych. peratiptera B' Orb. Voy. Am. Mer. 39. t. 3. f. 5-7. cop. 



1835 ; Feruss. et B' Orb. Ceph. Acet. Onythoteuthis, t. 10. f. 5. 7. 



Hah. Coast of ChUi. Indian Ocean. 



C. Cups of tentacular and sessile Arms with homy Rings. 

 9. OMMASTREPHES. 



Head short, cylindrical, rather depressed, rather narrowed behind 

 the eyes, and there very prominent longitudinal ridges on the 

 nape. Eyes very lar^e, lateral, naked, with an oval external open- 

 ing and a large lacrymal sinus. Buccal membrane very extensi- 



D 5 



