CEPHALOPODA.. 



FAMILY 



Body covered with a thin shell ; arms tapering, very unequal ; 

 cups prominent, in two series. 



ARGONAUTA. 



Shell one-celled, thin, transparent. 

 All tropical and sub-tropical seas. 



3. A. nodOSa, Sol and er ; Gray, I.e., p. 32. Shell compressed, 

 sides with transverse plications, which are longitudinally tubercu- 

 liferous ; keels two, with compressed tubercles. White, brownish on 

 the spire, where also the keel tubercles are blackish brown. Five or 

 six inches across. 



North Island, sometimes as far south as Wellington. Indian Sea. 

 South Pacific. Chili. 



Animal. Body oblong, rounded behind, smooth, spotted with 

 violet ; eyes large, prominent ; siphuncle united to the base of the 

 arms by a lateral membrane ; arms tapering, except the dorsal pair, 

 which are palmate at the end, these are the shortest, the next pair to 

 them the longest, and the others graduated ; the lowest pair are keeled 

 on the outside ; membrane small, all the arms equally webbed ; cups 

 large, less than their own diameter apart, in two rows, with a single 

 row of rather smaller cups round the mouth. 



Chatham Inlands. As the shell of this animal was not obtained, I 

 refer it doubtfully to this species, as it differs from Dr. Gray's descrip- 

 tion. 



OEDEE DECAPODA. 



Body oblong or cylindrical ; head smaller than the body ; eyes free 

 in the orbit ; arms ten, eight sessile, two tentacular, elongated ; fins 

 developed ; an internal shell, occupying the middle of the back. 



FAMILY OSYCHOTEUTHIDJ;:. 



Fins posterior, dorsal, angular ; eyes naked ; ears with a longitu- 

 dinal crest ; shell horny, lanceolate. 



ONYCHOTEUTHIS. 



Fins terminal, broad, together rhornboidal ; sessile arms angular, 

 cups in two alternating lines ; tentacular arms with a rounded group 

 of small sessile cups, and two series of claw-like hooks on each club. 

 Shell lanceolate, penuate, tip acute ; end produced, narrow ; sides di- 

 lated, thin, with a central longitudinal keel contracted at the end. 



Atlantic and Indian Oceans. 



*4. O. bartlingii, Le Sueur; Gray, I.e., p. 54. Body elongate; 

 back with a central transparent line over the keel of the shell ; sessile 

 arms slender ; tentacular arms with six large hooks. Shell dark brown, 

 with a short central keel above and a ridge beneath. 



Indian Ocean 



OMMASTREPHES. 



Fins terminal, broad, together rhomboidal ; sessile arms subulate ; 

 tentacular arms scarcely enlarged at the end, both they and the sessile 



