ONYCHOTEUTHIDiE : ONYCHIA, OMMASTREPHES. 
57 
Loligo Cardioptera Peron , Voy. Atlas , t. 60. f. 5. 1804 ; Blainv. 
Journ. de Phys. 123., Diet, des Sc. Nat. xxvii. 135. 
Sepiola Cardioptera Le Sueur, Journ . Acad. Nat Sc. Philad. ii. 
100. 1821. 
Cranchia Cardioptera Feruss. Diet. Class. Atlas , t. 5. 1823; D’Orb. 
Tab. Meth. Ceph. 58. ; Feruss. et D' Orb. Ceph . Acet. Cranchie , 
t. 1. f. 2, 3. cop. Peron; D' Orb. Voy. Am. Merid. Moll. 34. 
Sepia Cardioptera Oken , Lehrb. des Zool. 343. n. 5. 
Onychoteuthis Cardioptera D' Orb. Moll, des Antilles , i. 53. n. 13. 
1838, Moll. Viv. et Fos. i. 389. 
Onykia Caribsea LeSueur , Journ. Acad. Nat. Sc. Philad. ii, 98. t. 9. 
f. 1, 2. 1821. 
Loligo Caribasa Blainv. Diet. Sc. Nat. xxvii. 139. 1823, Journ. de 
Phys. lxxxvi. 127. ; Feruss. Did. Class, iii. 67. Atlas , f. 4. 
Onychoteuthis Caribaea Feruss. Ceph. Acet. Onyth. t. 5. f. 4. 7. 
from LeSueur; D' Orb. 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; D' Orb. 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 D' Orb. Voy. Am. Mer. 39. t. 3. f. 5-7. cop. 
1835 ; Feruss. et D' Orb. Ceph. Acet. Onythoteuthis , t. 10. f. 5. 7. 
Hab. Coast of Chili. Indian Ocean. 
C. Cups of tentacular and sessile Arms with horny Pings. 
9. OMMASTBEPHES. 
Head short, cylindrical, rather depressed, rather narrowed behind 
the eyes, and there very prominent longitudinal ridges on the 
nape. Eyes very large, lateral, naked, with an oval external open- 
ing and a large lacryinal sinus. Buccal membrane very extensi- 
D 5 
