944 liEPORT OF COMMISSIONER OF FISH AND FISHERIES. [18] 



taiu-like folds or solid consolidated moutli-parts of a majority of the 

 Acraspeda. The proboscis is a bag- shaped structure confluent with the 

 walls of the subumbrella. It is free at one end and open at the opposite. 

 This structure is fastened to the umbrella walls on a line which forms 

 a cross shaped figure, by which four lateral extensions and four re-en- 

 tering angles are formed in its external walls. The terminal opening 

 or mouth is smooth and destitute of appendages. The external sur- 

 fatje of the walls is quite smooth. 



The walls of the proboscis are formed of eight parts, four broad 

 alternating with four narrow. The broad lobes [lb. jyer.) are bag-shaped ; 

 the narrow lobes {Ih. int.) flat, muscular, narrow. The former are per- 

 radial; the latter interradial. At their union a stifl;' structure is 

 formed which serves as a means of common union and of firm attach- 

 ment to the lower walls of the umbrella. 



On three of the specimens observations were made in relation to the 

 cavity of the disk. The mouth opens directlj^ into the proboscis cavity, 

 or stomach, where we find four double lines of gastral iilaments. At 

 its base tlie stomach cavity is slightly constricted, and from the circular 

 jecess, thus partially separated from th"e stomach, four openings radiate. 

 The roof of tlie circular recess is formed by the under side of tlie um- 

 brella, and its floor is made up in part by the subumbrella wall. Its 

 diameter is about that of the diameter of the central disk {dis. cent.). 

 The four radial openings communicate with a ring-shaped sinus, "in- 

 testine," surrounding the central cavity placed in the corona. I was 

 unable to trace the course of certain radial pouches which were ob- 

 served to arise from the periphery of the coronal sinus. 



Subfamily, NAUSITHOIDJ5, HiBckel, 1879. 

 NauphajN'TOPSIs, gen. nov. 



(Plate VI.) 



]Smiphanta-\\\LQ, medusa, with thirty-two marginal lobes, twenty-four 

 tentacles, and probably eight marginal sense-bodies. With shallow 

 coronal furrow, and sculpturing on the exumbral side of the corona as 

 in Naupkanta. Thirty-two radial exumbral coronal furrows and the 

 same number of rounded elevations, instead of sixteen, as in Nau- 

 l)lianta. 



The genus Naujjhantopsis, although closely allied to Nauphanta, differs 

 from it so much in the arrangement of the tentacles upon the disk 

 margin and the number of marginal lappets, that I do not hesitate to 

 place it in a new genus. Both genera undoubtedly belong to the same 

 family and are morphologically among the most interesting of all so- 

 called deep-sea medusas. The single specimen of Nauphantopsis, col 

 lected by the Albatross, has the central disk, discus centralis {(Hs. cent.), 

 torn away, and with it have disappeared also the stomach and ovaries. 



