102 CLASSIFICATION. 



is secreted. Cups slightly pedicelled. A pair of aquiferous 

 pores at the upper hinder angle of the eye. 



SUB-ORDER II. DECAPODA. 



A. Decapoda cliondrophora. Internal shell horny. 



a. Myopsidce. Eyes covered by the skin : mostly littoral species. 



Family 4. LOLIGINID^:. Body rather long ; buccal skin some- 

 times armed with suckers ; tentacular arms only partially retrac- 

 tile ; fins lateral-terminal. Inner shell or gladius as long as the 

 back. 



Family 5. SEPIOLID^E. Body short ; buccal skin without suck- 

 ers ; tentacular arms completely retractile ; fins short, in the 

 middle of the sides of the back. Gladius only about half as 

 long as the body. 



b. Oigopsidw. Eyes naked : pelagic species. 



Family 6. CRANCHIID^;. Body rounded ; mantle united to the 

 head by a cervical band, and upon either side connate with the 

 base of the siphon ; head small, with large eyes ; arms short ; 

 tentacles long ; siphon long, not fastened to the head, and with 

 or without inner valve. Shell as long as the body, small, 

 lance-like. 



Family 7. CHIROTEUTHID^. Body rather long; mantle sup- 

 ported on the body by cartilaginous ridges; sessile arms, long, 

 partially webbed ; tentacles very long ; siphon short, without 

 attachment to the head or valve. Shell or gladius small, long, 

 lance-like. 



Family 8. THYSANOTEUTHID^:. Body rather long or oval ; 

 mantle supported by cartilaginous ridges and grooves ; arms 

 free ; siphon united to the head by two bands. Gladius dart-like. 



Family 9. ONYCHOTEUTHID^E. Body long, cylindrical ; mantle 

 supported by cartilaginous projections ; eyes with a lachry- 

 mal sinus; arms or tentacles armed with hooks; siphon with or 

 without bands and valve. Gladius generally lancet-form, with 

 an end-conus. 



Family 10. OMMASTREPHID^E. Body long, cylindrical ; arms 

 short, armed with suckers only ; the short tentacular arms non- 

 retractile ; siphon valved, united by bands to the head. Shell 

 small, lancet-form, with an end-conus. 



