ASTEROIDEA OF NORTH PACIFIC AND ADJACENT WATERS — FISHER. 223 



there is little central space. The enlarpjecl granules arc globose, obovoid, ovoid, 

 or thimble-shaped. PediccUariie are higher than any of the granules. 



Adambulacral plates with two blunt slightly compressed or cylindrical promi- 

 nent furrow si)ines which interlock with those across the narrow furrow, and behind 

 them a slightly longer but much heavier clavate, often swollen-tip{)ed spine with a 

 small (adoral) companion granule. The tip of the subambulacral spine is often 

 obliquely dressed or bent toward furrow. Outer edge of plate has three or two 

 granules larger than those immediately adjacent on actinal intermediate plates. 



Mouth plates with five furrow spines, of which the innermo.st is largest and 

 most compressed, and a large suboral situated at about the middle, behind which 

 are three smaller tubercular granules or spinclets, besides which about si.x unequal 

 granules border the median suture, tiio innermost being sometimes enlarged and 

 standing in line with the suboral. 



Madreporic body small, triangular, \\-ith relatively coarse striae. 



Type.— Cat. No. 27SS4, U.S.N.M. 



Type-locality. — Albatross station 34S0, ^Vnaukta Pass, Aleutian Islands Gat. 52° 

 06' N.; long. 171° 45' W.), 2S3 fathoms, black sand, coral, rocky (one specimen). 



Distribution. — Ivnowm only from the typc-locaUty. 



Remarlcs. — The only other tiescribed species of this genus is the type, C. rudis, 

 taken by the Albatross o(T Florida, at station 2415 (30° 44' X.), 440 fathoms, coarse 

 sand and shells. 



C. validus differs from C. rudis m havuig a definite tumid naked area on upper 

 surface of each superomarginal, abactinal pedicellarise, verj' unequal actinal inter- 

 mediate granules of larger size, larger actinal pedicellariie, and, relativelj- to the 

 abactinal granules, larger granules on lateral face of marginals. C. ntrfw has more 

 definite rays, the last four marginals being in contact medially, but this may vary 

 with age. The adambulacral spines seem to be relatively larger in I'alidus, but it 

 is difficult to be sure of this pouit without direct comparison of specimens. 



The type-specimen is probably young, but there are so many positive charac- 

 ters that it seems worth while to describe the species, especially as the genus is 

 Uttle known. 



Subfamily BCIPFA-STEmiN^aB Verrill, 189Q. 



Eippasteriins Verrill, Trans. Conn. Acad., vol. 10, 1899, p. 174. — Fibber, Bull. U. S. Fiah 



Comm., 1903, pt. 3, 1906, p. 1165. 

 Anthencidm Perkier, in part, and most authors. 



Genus HIPPASTERIA Gray. 



Bippasteria Grat, Ann. and Mag. Nat. Hist., vol. 6, 1840, p. 279. Type, 11. europiea Gray= 

 //. phrygiana (Parelius). 



Diagnosis. — Goniasterida? with large disk, short rays, bivalved pedicellaria?, 

 one to three elongated thick furrow spines and only one or two similar actinal 

 adambulacral spines; with two sorts of abactinal plates: (1) Large roundish tumid 

 primary plates bearing a central granule, tubercle, spine, or pedicellaria, and a 

 peripheral series of granules, and (2) more numerous small, irregular, crowded 

 intorniodiate plates which join the larger plates, and boar externally gninides, 

 pedicellaria^ and sometimes small spines and tubercle.'^, ^[a^ginid jilatcs with 



