2 BULLETIN : MUSEUM OF COMPAKATIVE ZOOLOGY. 



The Scjphomedusa (Bathyluca Solaris) is, judging from its structural 

 afliuities, a deep-sea type, although the single specimen from which 

 our figures were obtained was found upon the surface of Narragausett 

 Bay, Khode Island. 



The Medusae described in this paper were collected at different times 

 at Eastport, Maine ; Newport, Ehode Island ; Charleston, South Caro- 

 lina ; and in the Bahama Islands during visits made to the above 

 localities at the suggestion of Mr. Agassiz. 



SCYPHOMEDUS^. 



BATHYLUCA, nov. gen. 

 Bathyluca Solaris, nov. gen. et sp. 



Figs. 1, 3, Plate 1. 



A single specimen of a new genus of Discomedusa belonging to the family 

 EphvTida3 was found in Narragansett Bay, Rhode Island, on July 27, 1896, 

 by R. W. Hall, Esq. The medusa was found floating upon the surface, but as 

 it was very much torn and battered, and as it differs widely from any of the 

 hitherto known pelagic medusae of our coasts, we are inclined to suspect that 

 it may prove to be a deep-sea form, a specimen of which has wandered to the 

 surface. 



Generic Cliaracters. — Bathyluca, nov. gen. Discomedusce with a simple cru- 

 ciform, central mouth opening, without mouth-arms or palps. There are 

 16 wide, radial, gastro- vascular pouches (8 ocular and 8 tentacular). There 

 is no ring canal. There are 8 marginal sense-organs and 16 marginal ten- 

 tacles. There are 4 gonads in the oral floor of the dislv, and there are 4 

 sub-genital pits. 



Specific Characters. — The umbrella is flat, and the gelatinous substance is 

 quite thick. It is 45 mm. in diameter, and about 10 mm. in height. The 

 aboral surface of the umbrella is sprinkl«d over with small clusters of nomato- 

 cysts. There are 8 marginal sense-organs that are deeply sunken within small 

 niches between the lappets. The entoderm of these sense-organs contains no 

 pigment, V)ut instead there are small white granules (Figure 2). There are 24 

 marginal lappets and 16 long hollow tentacles. Tlie mouth opening is 

 cruciform in shape, and there appear to be no mouth-arnis or palps. We 

 may, however, be mistaken in regard to this, for our specimen was nuicli 

 torn and battered, and it is possible that the paljis may have disappean-d. 

 There are 4 wide sub-genital pits. The gonads are found in the entodiTm 

 of the lower floor of the gastro-vascular cavity, and tlieir position is marked 

 by 4 horseshoe-shaped ridges upon the lower floor of the sul>umbrella. There 

 are a number of long gastric cirri that arise from the regions of the gonads 



