CEPHALOPODA. 71 



Listr., 2 sp. W. Africa. lu the open sea. 



This genus makes the nearest approach to the octopods. 



Sepiola. (Rondelet) Leach, 1817- 



Ex., S. atlantica (D'Orb.) PI. I., fig. 4. 



Body short, purse-like ; mantle supported by a broad cervical band, and a 

 ridge fitting a groove in the funnel. F'ms dorsal, rounded, contracted at the 

 base. Suckers in 2 rows, or crowded, on the arms, in 4 rows on the tentacles. 

 Length 2 to 4 inches. 



Pen, half as long as the back. S. stenodactyla (sepioloidea, D'Orb.) has 

 ao pen. 



Bistr., 6 sp. Coasts of Norway, Britain, Medit., Mamitius, Japan, 

 Australia, 



Suh-genus. Rossia, Owen {Fldenas? Gray). Mantle supported by a 

 cervical ridge and groove. Suckers in 2 rows on the tentacles. Length 3 

 to 5 inches. 



Dlstr., 6 sp. Regent Inlet, Britain, Medit., Manilla. 



Sub-family B. Oigopsidce, D'Orb. 

 Eyes naked. Eins always terminal, and united, forming a rhomb. 



LoLiGOPSis, Lam. 1811. 

 Etym., loHgo, and opsis, like. 

 Type, L. pavo (Lesueur). 



Body elongated, mantle supported in front by a branchial septum. Arms 

 short. Cups in 2 rows. Tentacles slender, often mutilated. Eunnel valveless. 

 Ben slender, with a minute conical appendix. Length from 6 to 12 inches. 

 Bktr., pelagic. 8 sp. N. Sea, Atlantic, Medit., India, Japan, S. Sea. 



Cheiroteuthis, D'Orb. 



Etym., cheir, the hand, and teuthis. 

 . Type, C. veranii, Fe'r. 



Mcmtle supported in fi-out by ridges. Funnel valveless. Ventral arms 

 very long. Tentacles extremely elongated, slender, with distant sessile cups 

 on the peduncles, and 4 rows of pedunculated claws on their expanded ends. 



Pen slender, slightly mnged at each end. Length of the body 2 inches ; 

 to the tips of the arms 8 inches ; to the ends ot the tentacles 3 feet. 



Bistr., 2 sp. Atlantic, Medit. On gulf-weed, in the open sea. 

 HiSTioTEUTHis, D'Orb. 



Etym., histion, a veil ; and teuthis. 



Type, H, bonelliana, Fer. Length 16 inches. 



Body short. Fins terminal, rounded. Mantle supported in front by 

 ridges and gi-ooves. Buccal membrane 6-lobed. Arms (except the ventral 

 pair), webbed high up. Tentacles long, outside the web, with 6 rows of den- 

 tated caps ou their ends. 



