46 Mr. L. Barrett on new species of Echiuodermata. 



VII. — Descriptions of four new species q/" Echinodermata. 

 By Lucas Barrett, F.G.S. 



[With a Plate.] 



Eupyrgus hispidus, nob. PI. IV. fig. 1 a, h» 



Specific character, — Body covered with perforated, ovate plates, 

 each of which bears a single spine ; extremities more or less 

 produced, ascidiform. Suckers alternating, placed in three 

 double distinct rows on the under surface, reaching from mouth 

 to anus. Spines attached to the extremities of the plates by 

 four roots. 



This little species resembles in shape E* scaber, Lutken, from 

 the west coast of Greenland, which is of about the same size, but 

 differs in the shape of the plates bearing the spines ; for while 

 those in E. scaler are cruciform, the plates in the species now 

 described are ovate or irregular. (Fig. 2.) 



The genus Eupyrgus, which was made for the reception of 

 these two species, resembles Psolus in being covered with cal- 

 careous plates, and in having only three rows of suckers, but 

 differs in the absence of a naked disk, on which the suckers are 

 placed in that genus. 



Astropecten Lutkeni. PI. IV. fig. 3 a, b, c. 



Specific character. — Disk pentagonal; rays produced, pointed; 

 each side formed of two rows of plates, about forty in each row ; 

 those in the upper row are nearly as long as broad. The plates 

 forming the lower row are oblong. The apex of the ray is 

 formed of a single excavated plate. The marginal plates are 

 covered with numerous spines, and the whole of the upper sur- 

 face between the lateral plates is covered with tubercles crowned 

 by groups of minute spines smaller than those which cover the 



