]<>.! 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 chondrophora. Internal shell horny. 



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



Family 4. LoLTGiNiDyE. 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 

 hack. 



Family 5. SEPIOLID^S. 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. OigopsidcB. Eyes naked : pelagic species. 



Family 6. CRANCHIID^E. 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^E. 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 l>v two lauds. (Jladius dart-like. 



Family !). OXYCIIOTKI TII t D.K. IJody 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. (Jladins generally lancct-lorm. with 

 an end-conns. 



Family 10. OMMASTKKIMIID.K. IJody long, cylindrical; arms 

 short, a rmed with suckers only ; the short tentacular arms non- 

 retractile; siphon valved, united l>y hands to the head. Shell 

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



