214 A. E. Verrill — JRevision Genera and Sjjecies of Starfishes. 



It is, however, very much like the new genus Prionaster in appear- 

 ance, but it has a fasciolated sutural furrow running from the suture 

 of the jaws to the suture between the first pair of marginal plates. 



It has no odd interradial marginal plates, which are present in 

 Prionaster. The dorsal marginal plates do not bear spines as in 

 the latter. It has a large madreporic plate with fine radial gyri. 



The dorsal nephridial pore is surrounded by a large number of 

 very small paxillte, which form a low central prominence (probablj^ 

 much more elevated in the young). The papular poi-es are numer- 

 ous, small, arranged regularly, about six around each paxilla, over 

 most of the disk and on wide basal radial areas, but even in the 

 basal regions they are lacking along the three or four median radial 

 rows of paxillse and do not reach the ends of the rays. 



The paxillse are very numerous on the disk, smaller centrally ; 

 they are high, with rounded or elliptical tops, and covered with a 

 group of very small, shoi't, blunt spinules, of which one to three 

 are central. Distally the paxillse become narrow-elliptical and very 

 small. On base of the rays they form obliquely transverse rows. 



The marginal plates are mostly smooth except around the mar- 

 gins, and covered with thin membrane ; distally on the rays they 

 bear minute scattered granules. Around their margins there is a 

 regular rim, formed by the regular row of webbed spinules, which 

 project over the edges of the sutural grooves. In these grooves 

 there are several rows of much finer slender spinules. The apical 

 plate is rather large, obconic, unarmed. 



The actinal plates are large, angular, of various forms, not numer- 

 ous ; they extend out to about the 12th adambulacral plate, there 

 being but a single row of small ones beyond the Vth. They form, 

 proximally, double series, the two united rows -corresponding to 

 each marginal plate, but with from 1^ to 2-^ adambulacrals. The 

 actinal plates are flat and most of them bear from 1 to 3 minute 

 scattered spinules, besides the marginal fasciolated row. 



The adambulacral plates proximally have an oblique, angular fur- 

 row-series of 9 or 10 slender, divergent spines, webbed together at 

 base. Farther out, about the middle of the ray, the series becomes 

 more regularly convex and more prominent, with 10 to 12 smaller 

 and more slender spinules, which sometimes, in dry specimens, nearly 

 meet across the furrow, leaving large roundish or elliptical spaces 

 for the passage of the adambulacral feet, which are very large and 

 tapered, but without any sucker. The actinal margin of the adam- 

 bulacral plates has one or more series of small, stout, divergent 

 spinules, webbed together and fasciolated. 



