CEPHALOrODA. 165 



Arms longer than the body ; the two dorsal pairs the longest, 

 and webbed half-way up, and sometimes to the extremities. 

 Arms not webbed in male. 4 aquiferous (?) openings, two be- 

 tween the eyes, and two below ; sometimes there are small 

 openings on the sides ; sucJicrs in two rows ; third right arm 

 hectocotylised. 



DistribuU'ou, 3 species. T. quoyaiius, violaceus, and vdifer. 

 Atlantic and Mediterranean. 



PII^^OCTOPITS, D'Orb. Finned octopus. 



Body with lateral fins, united behind. 



The only known species, P. cordi/ormis, was discovered by 

 MM. Quoy and Gaimard, on the coast of New Zealand ; it 

 exceeds 3 feet in length 



Eledone. (Aristotle.) Leach. 



Type, E. octopodia, L. 



Suckers forming a single series on each ami ; length 6 to 18 

 inches. U. Moschata emits a musky smell. Third right arm 

 hectocotylised ; permanently attached ; developed free. 



Distribution, 2 species. Coasts of Norway, Britain, and the 

 Mediterranean. 



CmROTEUTnis. Eschi-icht. 1836. 



Synonyms, Sciadephorus (Eeinh and Prosch) ; Bostrycho- 

 teuthis (Ag.) 



EtymoJoyy, cirrus, a filament, and teuthis, a cuttle-fish. 



Body with two transverse fins ; arms united by a web, nearly 

 to their tij^s ; suckers in a single row, alternating with cirri. 

 Length 10 inches. Colour violet. The only species (C. J\[iiUcri, 

 Esch.) inhabits the coast of Greenland. 



PniLONEXis, D'Orb. 



Etymology, philos, an adept in nexis, swimming. 



Type, P. atlanticus, D'Orb. 



Arms free ; suckers in two rows ; mantle supported by two 

 ridges on the funnel ; eyes largo and prominent. Total length, 

 1 to 3 inches. 



Distribution, 6 species. Atlantic and Mediterranean. Gre- 

 garious in the open sea ; feeding on floating mollusca. 



Sc^UEGUS. Troschel. 1857. 

 Body oval, without fins ; wider than tho head ; arvia .short ; 



