194 BULLETIN OF THE 



zoster proper, namely, of such species as Sch. canaliferus, Sch. fragilis, Sch. Phi- 

 lippii, but Las the outlines of Ihmiaster, the fascioles of Periaster. It has but 

 two "enital openings. "When brought up in the dredge, this species was of a 

 dirty yellowish-brown color. 



In order to retain for the Challenger Echini the priority, I did not intend to 

 figure or fully describe in this paper any of the species previously dredged by 

 the Challenger. From a preliminary examination of the two specimens brought 

 home by the Challenger, I had, without having denuded the test, referred 

 them to Hemiaster. My mistake I discovered only too late, after the plates of 

 this paper were printed. As the figures represent specimens of a much larger 

 size than those of the Challenger, they will not duplicate those to be given 

 for the Challenger Echini. 



In the vicinity of a thousand fathoms in depth and below it, we find in the 

 Gidf of Mexico genera dredged by the Challenger in deep water in the Atlantic 

 and Pacific, which appear to have an oceanic distribution, such as Homolampas, 

 Palceotropiis, Aspidodiadcma, Paleopneustes, Coelopleurus, Salenia^ Pourtdksia, 

 although some of these genera extend to a far less depth in the Gulf of Mexico, 

 owinff, however, to the special physical conditions of the Caribbean Sea and of 

 the Gulf of Mexico. I will not attempt any general bathymetrical classification 

 of the genera thus far obtained until after the dredgings of the coming season, 

 which it is hoped will give us better material for a comparison of the deep-sea 

 Caribbean Fauna with the collections of Echini brought home by the Challenger. 

 As will be seen, the bathymetrical range of the new genera and species first 

 collected l)y Mr. Pourtales has been greatly extended, some of them reaching 

 into the depths occupied by the strictly deep-sea foims mentioned above, which 

 have a general distribution in the abyssal waters of the Atlantic and Pacific 

 Oceans. 



