ONYCHIA. 171 



terior extremity ; head rather swollen ; sessile arms subequal ; 

 tentacular arms somewhat longer, with two hooks in the median 

 line of the clubs between the cupules. Yellowish white, with 

 brown ocellated spots on the back and sides, and brown specks 

 on the arms and head. Total length, 2 inches. 



Off San Francisco, Gal. 



Not figured. A single specimen obtained, which Mr. Dall 

 doubtfully refers to this genus. No mention is made of hooks 

 on the sessile arms, a character which places 0. Kamtschatica, 

 Middendortf in the genus Enoploteuthis, but in the peculiar 

 arrangement of two hooks, surrounded with suckers on the ten- 

 tacular clubs, the two species are alike 1 . 



0. LONGIMANUS, Steenstrup. 



This species is only shortly characterized and not figured, and 

 is referred with doubt to the genus Onychoteuthis. It is said to 

 differ from all known forms, by the extraordinary length of the 

 second pair of sessile arms, which are four times the length of 

 the head, and. double that of the tentacles. 



Genus ONYCHIA, Lesueur. 



0. CARIB^A, Lesueur. PI. 75, figs. 306, 307. 



Body oblong, narrowed and prolonged behind ; fins round, 

 terminal, together subrhomboidal ; arms unequal, order of length 

 3, 2, 4, 1 ; tentacles scarcely enlarged at the end. Shell pen- 

 nate, rather broad, sides rounded. Length, 80 mill. 



West Indies. 



D'Orbigny and Gra} r have confounded this species with 0. 

 car diopter a, the latter being, as Souleyet has pointed out, a true 

 Loligo, having no hooks on the tentacles. 



O. PERATIPTERA, D'Orb. PI. 75, figs. 308-310. 



Body cylindrical, pointed behind ; fins triangular, very wide 

 and narrow ; sessile arms long, relative lengths 3, 4, 2, 1 ; cups 

 very unequal, especially of the lateral arms ; tentacles short, 

 not enlarged at the ends. Shell broad, lanceolate, apex with a 

 conical, compressed appendix. Length, 5 inches. 



Coast of Chili, Indian Ocean. 



