A. JEJ. Verrill — Mevision Genera and Species of Starfishes. 171 



ing. The larger plates often bear fifty to seventy granules ; the 

 small intermediate plates frequently carry but nine to twelve, one or 

 two being central. Actinal plates large, rhombic, uniformly covered 

 with coarse, angular granules, distinctly larger than those of the 

 marginal plates. • 



Adambulacral plates numerous and crowded, similar to the actinal 

 plates, but slightly larger and longer; toward the ends of the rays 

 the plates are smaller and one or two of the first actinal row of 

 spinules become much larger and longer, round and blunt. Each 

 plate usually bears three or four marginal spines in a simple row ; 

 outside of these there are usually nine to twelve thicker, obtuse, 

 angular spines, forming four ii-regular longitudinal rows, the outer 

 ones smallest and like the actinal granules. 



Dentary plates not prominent, covered with numeroiis blunt, angu- 

 lar spinules, similar to the actinal spinules, but larger. 



The papular pores are numerous, placed singly, and occupy large 

 radial areas, extending nearly to the center of the disk. 



No pedicellarife could be found. 



Greater radius of the type, 50™"; lesser radius, 35™"^; thickness at 

 margin, S"""". 



N. lat. 39° 53', off Martha's Vineyard, in 156 fathoms, one speci- 

 men (No. 13,362). 



Litonotaster Ver. , gen. nov. Type, P. intermedins Per. 



Stellate, with a rather broad, flat, flexible disk and tapered rays, 

 becoming slender distally. The dorsal integument is so thin that 

 it is wrinkled in the dried specimens. Marginal plates unusually 

 small for this family. The dorsal ones encroach but little on the 

 upper surface of the disk ; distally they become irregular near the 

 tip of the rays, in the type; two to four pairs are in contact medially 

 (a single oblong i^late, equal to two or three of the usual distal 

 plates, may replace the latter on some of the rays). 



Abactinal plates polygonal, flat, thin, closely united, finely granu- 

 lated, with two or more rows of granules around the edges, but with 

 a small, central, round, naked area, in the type. 



Papular pores rudimentaiy, few, small, obacure, not visible except 

 when the plates ai'e denuded ; they occur only between the three 

 central rows of plates, in a very circumscribed basal radial area. 



Actinal plates granulated, rather large, angular, of various forms, 

 not forming regular rows. 



