ITS OMMASTKKPHKS. 



O. CHASSI s. Lafont. PI. 7<>. fig. :U7. 



Body . Mini anus thick; tentacles shorter than the body, the 

 teeth of tin- small sucker-rings pointed and curved ; fins form- 

 ing an irregular parallelogram, the upper sides of which arc 

 shorter Hum the lower. Shell narrow. Length. '20 to '24 inches. 



Bay of Biscay. 



Very closely allied to 0. sagittatus, from which it differs in 

 size, in the form of the fins, and the denticulations of the rings 

 of the suckers. 



J $ Tentacles with four rows of suckers, those of the middle rows larger. 



O. COINDETII, Verany. PI. 7S. fig. :US ; pi. 7'.). fig. :!4<) ; pi. so, 



figs. ;*<;<;. :-5i>7. 



Body pellucid, cylindrical, slightly fusiform, acinninate to a 

 point posteriorly; fins heart -shaped, about one-fourth the length 

 of the body; anus nearly equal ; tentacles a little more than 

 double the length of the arms, and nearly as long as the body. 

 the subulate ends deprived of suckers. Shell narrow, its cone 

 equally narrow. Total length, including tentacles. ,~> inches. 



Mediterranean. 



The shell with narrow cone, the arrangement of suckers on 

 the tentacles, especially the ends being without any. whilst in 

 0. sagittatus they have eight rows of them, and the differently 

 shaped (ins serve to distinguish this species from the latter, 

 with which it has been confounded. 0. Toucha,r<li. Souleyet 

 (figs. :;r.C>. o;7). is probably the young of this species. 



O. ^QUIPODA, Riippell. PL 7S. figs. :;4S-:;r>0 : pi. 7 ( .i. fig. :5f>l : 

 pi. so, figs. :](;:;-:!<;:>. 



Body conical-fusiform, acuminate behind ; fins not a quarter 

 the length of the body, short and wide, diamond-shaped; arms, 

 order of length .'! 1. 1 =2; tentacles nearly double the 



length of the arms, and nearly as long as the body, the clubs 

 covered with tubercles to their pointed ends, of which the 

 middle ones are larger. Shell narrow, with a slight expansion 

 at the cone. Length, including tentacles. .VC, inches. 



Cape Verd Isles ; Mediterranean. 



Distinguished from 0. GoinJctii by its tentacles, fins and shell. 





