A. E. Verrill — Hevision Genera and Species of Starfishes. 197 



Rosaster Alexandri Perrier. 



Pentagonaster Alexandri Perrier, Bull. Miis. Comp. Zool., ix, p. 22, 1881. 



Nouv. Arch, du Mus., vi, p. 238, pi. vi, figs. 3-8, 1884. 

 Rosaster Alexandri Per., Exp. Sci. Trav. etTalism., Echinod., p. 387, 1894. 



This species has rounded, columnar, paxilliform abactinal plates, 

 covered, like the marginal and actinal plates, with small spinules. 

 Most of the upper marginal plates of the rays are in contact 

 medially. 



The genus jRosaster is evidently very distinct from Paragonaster. 

 Perrier states that it has no pedicellariaj of any kind, but some of the 

 larger specimens that I have examined have had a small number of 

 simple pedicellarire on the actinal plates. 



The larger examples have two long, slender spines on the actinal 

 side of the adambulacral plates. 



It was taken at several stations by the Blake, in 84 to 1930 

 fathoms, and by the Albatross at a number of stations in the West 

 Indies and Gulf of Mexico, in 182 to 980 fathoms. 



INCERTA SEDES. 



Hoplaster Peri-ier. Type, H. spinosus Per. 

 Hoplaster Perrier, 1882, Rapport, p. 32. Exped. Trav. et Talism., p. 323, 1894. 



Form pentagonal with short rays. Marginal plates well-developed, 

 not numerous, spinulated. An odd marginal interradial above and 

 below. Abactinal and actinal plates angular, crowded, closely 

 united, covered with a group of elongated spinules. No pedicel- 

 lariaB observed. Adambulacral plates with three or four spinules in 

 the furrow-series and an irregular group of spinules on the actinal 

 surface. Jaws without a recurved spine. 



The relations of this genus are doubtful. Perrier placed it next 

 to Gnathaster^ on account of the odd marginal plate, etc. (See p. 

 202). It may, perhaps, belong to Goniasteridfe, or be allied to Lasi- 

 aster. The details of its skeleton are not known. 



Hoplaster spinosus Perrier, 1882, Rapport, p. 32. Exped. Trav. et Talism., 

 p. 324, pi. xiv, figs. 2o, 26, 1894. 



Off the Azores, etc., 2995 to 3307 meters. 

 Only small examples are known. 



