158 itossiA. 



S. LEUCOPTERA, VeiTill. 



" Species probably small, but the three specimens observed 

 are probabl}' not lull grown. l>ody sliort, depressed, with the 

 mantle smooth. Ventral surface in middle, with a somewhat 

 flattened heart-shaped or shield-shaped area, surrounded, except 

 in fi'ont, by a silver}- white band, having- a pearly or opalescent 

 lustre. E3'es small, with round pupils. Fins large, in the living 

 specimens nearl^^ as long as body, broadly rounded ; the poste- 

 rior lobe reaches nearly to. end of body, the anterior edge be- 

 3'^ond front of mantle to the eye. The anterior edge of the 

 mantle is emarginate beneath ; above it is broadly attached to 

 the head. Sessile arms short ; upper ones shortest ; third pair 

 largest ; tentacular arms slender, extending back to end of bod}-. 

 Upper surface of body thicklj' sjjotted with orange brown." 



Length to base of arms, 14 mill., in alcohol ; of mantle above, 

 H mill. ; breadth, 7 mill. ; breadth across fins, 1(5 mill. 



GuJf of Maine, 'SO miles E. from Gape Ann, 



110 fathoms, muddy bottom. 



I am by no means satisfied that this is a Sejnola, and unfor- 

 nately Prof. Verrill has neglected to describe the shell, which 

 would have fixed its generic position definitely. Whatever 

 genus it may belong to, however, the characters and proportions 

 given above indicate decided immaturity in the specimens ex- 

 amined, and afford no valid reason for the supposition that the 

 adult will prove to be distinct from the species already described. 



Genus ROSSIA. Owen. 



K. PALI'EBRUSA, Owen. 



Body oblong ; head nearly as large as the body, swollen at 

 the eyes ; tins placed anteriorly, contracted at their junction 

 with the body ; arms short, very unequal, order of length .3, 4, 

 2, 1, cups in two rows at the base, and in many rows at the end 

 of the arms, similar in size ; tentacles elongate, with very 

 many minute suckers on the clubs. Total length, 5 inches. 



Arctic Seas. 



Owen thinks that the eyelids discovered in this species, and 

 from which it derives its name, are a peculiar organization 

 designed as a defense for the eyes against the spicular ice crj'^s- 

 tals, which, in the summer season, crowd the northern waters. 



