106 CLASSIFICATION. 



Fins oval, dorsal. Gladius lancet-form, only half as long as the body, 

 margins thickened. First left arm hectocotylized. 



ROSSIA. Generally like Sepiola, but the mantle is supported cervically 

 by a ridge ; arms with two or four rows of sessile suckers. First left 

 arm and middle of first right arm hectocotylized. Shell lancet-form, 

 small. 



Family VI. CRANCHIIDJB. 



CRANCHIA. Characters generally those of the family. Body short, 

 rounded ; fins very small, rounded, terminal ; buccal membrane pro- 

 duced into eight lobes ; arms short, with two rows of suckers ; tentacu- 

 lar clubs finned behind, with suckers in eight rows. Siphon valved. 



LoLiGorsis. Body long, attenuated behind, with large fins ; siphon not 



Family VII. CHIROTEUTHID^E. 



CHIKOTEUTHIS. Body long, attenuated ; arms long, connected by a short 

 basal web, with two rows of small, long-pedunculated suckers ; ten- 

 tacles very long and narrow, covered their whole length with scattered 

 suckers, the clubs with four rows of long-pedunculated suckers. Pen 

 slender in the middle, slightly winged at each end. 



HISTIOTEUTHIS. Body short, cylindrical ; head long ; arms long, the 

 three superior pairs connected by a largely developed web, the ventral 

 pair free ; tentacles long, with six rows of dentated cups on their clubs ; 

 buccal membrane six-lobed. Pen short and broad. 



Family VIII. THYSANOTEUTHIDJS. 



THYSANOTEUTHIS. Body with large triangular fins the whole length of 

 each side ; arms with lateral expansion of the skin, and two rows of 

 pedunculated suckers, from which spring threads which are connate 

 with the surface of the lateral expansions. Shell file-shaped. 



Family IX. ONYCHOTEUTIIID.K. 



GONATUS. Body like Lolifjo ; arms thick, with four rows of small suck- 

 ers ; tentacular clubs with many rows of small suckers, and a single 

 large basal cup armed with a hook ; siphon not connected to the head, 

 without valve. Gladius lancet-form. 



ONYCHOTEUTHIS. Arms with two rows of suckers, the rings of which 

 are not toothed; tentacles thick, their clubs with two rows of strong 

 hooks, and at the base a rounded group of suckers, with which they are 

 supposed to unite the two tentacles, and use them in conjunction as a 

 point d'appui, where great strength is required in capturing their prey. 

 Gladius lancet-form, with a conical commencement. 



