1*76 A. A Verrill — Hevision Genera and Species of Starfishes. 



on each side by a regular row of about the same size and form, 

 arranged alternatingly. 



Papular pores are arranged singly around and between the three 

 central radial rows of plates, except distally, usually six to a plate, 

 but are absent from the small interradial areas. 



Actinal plates are few, rather large, angular, rather irregular and 

 do not extend beyond the second pair of marginal plates, in the 

 type ; they are covered with well spaced, coarse granules. Pedicel - 

 lariae with two elevated spatulate blades occur on the middle of some 

 of the actinal plates. 



Adambulacral plates bear relatively large and long, prominent, 

 interlocking, spatulate or club-shaped spinules. Two of these, on 

 each plate, belong to the furrow-series and are much flattened. Out- 

 side of these, there is a stouter median spine, of the same length, 

 usually not much flattened, clavate or blunt at the tip; outside of 

 this there are usually two smaller, conical spinules, on the actinal 

 margin. The larger spines of the first actinal row do not increase 

 in size distally, as in Ihsia, etc., but gradually decrease. 



The dentary plates are rather large, flat, and bear marginal and 

 sutural rows of elevated, flattened or spatulate spines, like those of 

 the furrow-series. 



This genus seems to be more nearly allied to Hippasteria than to 

 any other. 



Cladaster rudis Ver. , sp. nov. 



Plate XXVIII. Figures 2, 3a, 26, 2c. 



Rays narrow distally with four dorsal marginal pairs of plates in 

 contact medially ; these distal plates are small and not regularly 

 paired. Radii about as 2 : 1 ; greater radius, 25'°'"; lesser, 12°''°. 



Dorsal marginal plates vary from 13 to 15 on different sides of 

 the body. Ventral plates 15. Those of both series are similar in 

 form and size, thick, somewhat convex, rectangular, higher than 

 long on the interradial margins, and encroach considerably upon 

 both sides of the disk ; they are separated by deep sutures. Four 

 larger pairs form the margins of the disk; those on the rays become 

 rapidly smaller and more square. Those of both series are sparsely 

 covered with coarse, rounded, well-spaced granules, man}^ of which 

 have fallen off, leaving small, shallow, rounded pits on the central 

 portions of some of the plates. The marginal granules are of the 



