192 A. E. Yerrill— Revision Genera and Species of Starfishes. 



Jaws a little prominent, bearing a large number of slender mar- 

 ginal spines and very numerous similar ventral ones, in about two 

 crowded rows on each half. The apical spines are only a little 

 larger than the marginal ones. 



Adambulacral plates on the middle of the rays bear about four or 

 five relatively very long and very slender, terete spinules on the 

 convex marginal edge ; one to three on the actinal surface, of simi- 

 lar size and form, and four or five divergent ones on the outer mar- 

 gin, that are shorter, but of the same form. No pedicellaria? were 

 seen. The abactinal and ventral plates and paxillse are much larger 

 and fewer than in any species of Plutonaster or Dytaster, of similar 

 size, and the appearance is decidedly hispid under a lens, owing to 

 the elongated and acute spinules of the whole surface. Greater 

 radius, 12™™; lesser, 6"™. 



Taken by the Blake Expedition in the West Indies, in 600 

 fathoms, and by the U. S. Fish Commission Steamer Albatross. 



The specimens of this species that I have examined are doubtless 

 immature, but they differ decidedly from the young of the other 

 known American species. It is not a typical Pseudar chaster. 



The specimen from the Blake Expedition was mixed with speci- 

 mens labelled as Plutonaster intermedius by Perrier. 



Pseudarchaster granuliferus Ver., sp. nov. 



Plate XXX. Figures 6, 6a. 



Form stellate with a broad disk and deeply emarginate sides, the 

 rays wide at base and tapering rapidly to acute tips. 



Radii as 1:2.20. Greater radius, 22™™; lesser, 10™™. 



The marginal plates are large and thick, encroaching considerably 

 on both sides of the disk, producing a rather thick rounded margin. 

 The upper ones are closely covered with polygonal granules ; the 

 lower ones are closely covered with small, uniform, closely appressed, 

 ovate, subsquamiforra granules or granule-like spinules, without any 

 larger median ones. 



The abactinal plates are small, rounded, elevated, and covered 

 with a polygonal group of prismatic granules, about five to eight 

 forming the central cluster. Papular pores are regularly arranged, 

 and placed singly between the basal radial plates. The madreporic 

 plate is small and irregular. 



Actinal plates are crowded and covered with spaced polygonal 

 granules, without any spinules. On each area there are three to 

 five special pectinate fascicles of small size, one of which is opposite 



