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 chondrophora. Internal shell horny. 



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



Family 4. LoLiGiNiDiE. 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. 



Famil}' 5. Sepiolid^. Bodj^ 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. Oigopsidcv. Eyes naked : pelagic species. 



Family 6. Cranchiidye. Body rounded ; mantle imited 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 bod}^, small, 

 lance-like. 



Family 7. Chiroteutiiid^. Bodj^ 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 b^^ cartilaginous ridges and grooves ; arms 

 free ; sii)hon united to the head b^-- two bands. Gladius dart-like. 



Family 9. Onychoteutiiid^. Bod}^ 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 generall}' lancet-form, with 

 an end-conus. 



Family 10. Ommastrephidvb. Bod}^ long, cylindrical ; arms 

 short, armed with suckers onl3- ; the short tentacular arms non- 

 retractile ; sii)lion valved, united by bands to the liead. Shell 

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



