A. JEJ. Verrill — Revision. Genera and Species of Starfishes. 185 



The name Dorigona, used foi* this genus by Perrier, is untenable. 

 The type of Gray (1866) was D. Iieevesii= Ogmaster capella, and 

 the only other spet;ies mentioned by him was longimana (Mobius). 

 The genus, as understood by Gray, was synonymous with Ogmaster 

 (Von Mart.) of earlier date, and therefore should be dropped. If it 

 were desirable to retain it at all, it should have been restricted to 

 J), longimana. For the latter, Sladen, 1889, established the genus 

 Iconaster, thus excluding Dorigona from the system. 



Perrier, 1876, p. 44, used Dorigona for a section or a subgenus of 

 Pentagonaster, and included in it P. longimanus and P. capella (as 

 Mtilleri), thus closely following Gray. But in his later work (1894), 

 he has restricted it to Nymphaster Sladen, a group totally unknown 

 to Gray and to Perrier, himself, in 1876. 



This total transposition of the name is not justifiable. Perrier, 

 himself, has disapproved of such a course in other cases of the same 

 kind. 



Seven species of Nymphaster have been described from the 

 Atlantic and others from the Indo-Pacific. Probably the number 

 of Atlantic species may be hereafter reduced when direct compari- 

 sons of the types shall have been made. I have studied only the 

 three American species, from the types of Perrier and a good 

 series dredged by the Albatross. 



Atlantic species of Nymphaster. 



Nymphaster ternalis (Per.). 



Pentagonaster ternalis Per., 1881, p. 20; 1884, p. 233, pi. x, fig. 1. 

 Nymphaster (?) ternalis Sla. , 1889, p. 752. 

 Dorigona ternalis Per., 1894, p. 371. 



Plate XXVI. Figure 7. 



West Indies, in 416 and 734 fathoms (Blake Exped.). Also 

 dredged by the Albatross, at nine stations in the Gulf of Mexico 

 and West Indies in 196 to 1181 fathoms, muddy bottoms, and at two 

 stations off Brazil. 



Nymphaster subspinosus (Per.). 



Pentagonaster subspinosus Per., 1881, p. 21 ; 1884, p. 234, pi. vi, fig. 1. 

 Nymphaster (?) subspinosus Sla., 1889, p. 752. 

 Dorigona subsjyinosa Per., 1874, p. 375. 



West Indies, 163 to 209 fathoms (Blake Exped.). Also dredged 

 by the Albatross at two stations in the West Indies, in 338 to 388 

 fathoms, coral sand and gray sand. 



