522 



CEPHALOPODA. 



Genus ONYCHOTEUTHIS, Lichtenstein. 

 Body and fins as in the genus Loligo ; 

 ventro-lateral cartilages of the mantle 

 long and narrow ; horny hoops of the 

 tentacular, and sometimes of the bra- 

 chial, acetabula produced into the form 

 of hooks or claws. ( Fig. 215.) Gla- 

 dius long, broadest in the middle. 



Genus ROSSIA, Owen. Body short and 

 rounded ; cephalic margin of the mantle 

 free ; fins advanced, short, circular, ses- 

 sile, distant and subdorsal. Gladius 

 short and narrow. 



Ex. Rossia palpebrosa, Owen. 



Genus SEPIOLA, Leach. Body rounded, 

 short; anterior margin of the mantle 

 adherent to the back of the head ; fins 

 advanced, circular, short, subpeduncu- 

 late, distant and subdorsal. Gladius 

 short and narrow. 



Ex. Sepiola Rondeletii, Leach. 



B. Funnel unprovided with an internal 



valve, and adherent at the antero-lateral 

 parts of its base to the mantle. 



Genus LOLIGOPSIS, Lamarck. 



Body long arid cylindrical, terminated by a 

 pair of conjoined large round fins, forming 

 generally a circular disc ; anterior border 

 of the mantle adherent to the back part 

 of the head for a small extent. Tenta- 

 cula very long and slender, (frequently 

 mutilated.) Gladius long, narrowest in 

 the middle, dilated posteriorly. 



Ex. Loligopsis Veranii, Ferussac. (Fig. 

 209; D the gladius or rudimental 

 shell.) 



Genus CRANCHIA, Leach. Body elon- 

 gated, sacciform; anterior margin of 

 the mantle adherent to the back of the 

 head. Fins short, rounded, subpedun- 

 culate, approximate, dorsal, and sub- 

 terminal. Gladius long and narrow. 



Ex. Cranchia scabra, Leach. 

 Tribe OCTOPODA. The Dibranchiate 



Fig. 209. 



Loligopsis Veranii. 



