[19] 



MEUUS.E FROM THE GULF STREAM. 



945 



Still the walls of the corona are iutact and the marginal lobes, with a 

 few tentacles, are in a good condition for study. 



The systematic position of this genus is in the family of Xausithoida?, 

 and it lies between JSFauphanta, and Collaspis of the CollaspidaB. Nau- 

 phantopsis, more closely even than N'auphanta, is related to the well- 

 known genus Periphylla in possessing three tentacles between two 

 marginal sense-bodies. It probably (?) has, however, eight sense-bodies 

 on the disk margin instead of four, as in the last mentioned genus. The 

 sculpturing on the corona of the umbrella also resembles that of 

 Periphylla in a distant manner. Nmtphaniopsis is allied to the Peri- 

 phyllidai on the one side and to the Collaspidie on the other. 



A (single specimen of Nauphantopsi.s was taken by the Albatross at 

 the following station : 



In ray description of the species I have availed myself of what is 

 known of the allied genus, Nauphanta, to which it has many resem- 

 blances in a discussion of doubtful points of structure. 



Measurements. 



In the type specimen of N'auphantopsis I was unable to discover with 

 certainty the character or number of the marginal sense-bodies. If 

 these bodies are present they are probably verj- obscure and simple, as 

 might be expected from the anatomy of those of closely related genera. 

 As in the genus Nmq^hania, the depth at which these medusse occur has 

 probably led to a reduction in the complication and size of these bodies. 

 Three tentacles in adjacent marginal indentations were observed, aris- 

 ing in a position similar to that of the tentacle in Nauplianta. Consid- 

 ering the number of marginal sense-bodies as eight, as in Nauplianta., 

 we tind there are eight intervals or octants, each with three tentacles, 

 or twenty-four tentacles in all. 



We can hardly suppose that there are only four sense-bodies, since 

 from their probable arrangement on the bell margin we would have 

 twenty-eight intervals (indentations between marginal lappets) to be 

 occupied by twenty-four tentacles, or six in each quadrant and two re- 

 maining, nor sixteen sense-bodies, since I have observed in one segment 

 three tentacles side by side. Sixteen sense-bodies would imply only 

 H. Mis. G8 GO 



