CLASS] I'MCATION. 107 



Onychia. Geuerully like OnyclioteutJm ; teiitucles thin, clubs with two 

 rows of hooks, two rows of suckers, and a circle of suckers at the base 

 for supporting- the tentacles together. Gladius feather-like. 



Enoploteuthis. Body lony, cylindrical, with triangular fins either at 

 the end or all along- both sides (sect. Ancesirocheirus) ; arms witli two 

 rows of hooks, and with sometimes (sect. Abralia) suckers at their 

 ends ; tentacles with hooks only ; siphon connected with the head by 

 bands ; the fourth right or left arm hectocotylized. Shell feather-like 

 or blade-shaped. 



Veranta. Body cylindrical, thin, rounded behind, with fins along 

 nearly the whole length ; arms with two rows of small hooks ; tentacles 

 thin, shorter than the sessile arms, with small suckers ; siphon con- 

 nected by bands. Shell feather-like. Too close to Enoploteuthis. 



Plesiotedthis. ( Fossil only. ) Body rather long, attenuated behind ; arms 

 with hooks. Shell small, lancet-formed, with a central and two side 

 ridges, and an arrow-shaped point. 



Cel^no. (Fossil only.) Body oval ; arms with hooks and suckers. Shell 

 a rounded blade, with winged projections on either side of the pen ; 

 nucleus central. 



DosiDicus. Body long ; arms with large suckers on the lower half, and 

 many small ones on the upper, thimier half ; clubs of the tentacles with 

 four or five hooks. Shell with a large, nearly solid end-cone. 



Family X. OMMASTREPHID.E. 



Ommastrephes. Body long, cylindrical ; arms short, with two rows of 

 suckers ; tentacles short, not retractile, the clubs with four rows of 

 suckers ; siphon valved, fastened to the head by bands. Shell small, 

 lancet-form, with a hollow end-conus. 



Family XL SEPIID.E. 



Sepia. General characters those of the family ; under the eyes a lid-like 

 fold, over them lachrymal openings ; six aqueous pores in the buccal 

 membrane ; arms short ; tentacles long ; suckers long-pedunculated ; 

 siphon with very large valve. Fourth left arm hectocotylized to its base. 



Hemisepius. Differs from Sepia by the sessile arms having only two 

 rows of suckers ; the ventral surface of the mantle with aqueous pores 

 situated in little nipples, and connected together by a longitudinal 

 groove. The very rudimentary calcareous partitions of the inner side 

 of the cuttle-bone only cover a portion of the excessively thin plate. 



