24 BULLETIN 76, UNITED STATES NATIONAL MUSEUM 



diameter of disk (10 r) from the base of the ray. The mature gonads end at a distance 

 of about 5 r from the base of ray. The hepatic coeca extend nearly as far as the im- 

 mature gonads or about 10 r from base of ray. The exposed ridge of the ambulacral 

 ossicles toward the coelom is roughened by numerous mmute spiny points. 



Type.— Cat. No. 22349, U.S.N.M. 



Type-locality.— Station 4530, 6.8 miles northwest of Point Pmos, Monterey Bay, 

 Calif.; 847 to 755 fathoms, soft gray mud; four specimens. 



Distribution.— Taken only off Point Pinos, Calif., in 755 to 1,062 fathoms, on 

 soft gray mud and on hard sand and mud. 



Specimens examined.— Seven; four from type-locality and three from station 

 4537, 7.4 miles northwest of Point Pinos, 1,062 to 861 fathoms, hard sand and mud; 

 bottom temperature, 38.5° F., approximately. 



Genus FREYELLA Perrier 



Freyella Perrier, Ann. sci. nat., zool., vol. 19, art. 8, 1885, p. 5. Type Freyella spinosa, 

 first species, by subsequent designation, Fisher, Ann. and Mag. Nat. Hist., ser. 8, 

 vol. 20, 1917, p. 428; ser. 9, vol. 2, p. 104. 



Freyellidea Fisher, Ann. and Mag. Nat. Hist., ser 8, vol. 20, 1917, p. 429. Type Freyelhdea 

 microplax; also Ann. and Mag. Nat. Hist., ser. 9, vol. 2, p. 104. 



Diagnosis. — Differing from Freyellaster Fisher in having only two gonads to each 

 ray, in having a normal muscular symphysis between the first and second adam- 

 bulacral plates (no syzygy), in lacking marginal plates entirely in the interbrachial 

 angles, and in having the first adambulacral plates either joined, with tissue between 

 or else separated nearly or quite to their proximal ends. Touching the lower end of 

 the interradial plate is a pair of very inconspicuous plates lying in the same plane, 

 and superficially appearing to be a portion of the interradial plate. They are really 

 the extreme outer end of the mouth plates. They have the appearance of being 

 separate plates because the inner end of the first pair of adambulacral plates nearly 

 or entirely segregates them from the actinal or spine-bearing surface of the mouth 

 plates. In those genera which have marginal plates in the interradius, this dorsal 

 part of the mouth plate is entirely hidden by the marginals. Proximal subambulacral 

 spines usually with modified tips. 



Remarks.— The species of this genus superficially resemble those of Freyellaster. 

 I do not think they are so near to that group as to Astrocles. Both Freyella and 

 Astrocles have only two gonads, and lack the marginal plates which form a character- 

 istic part of the skeleton of the interradial angle in Freyellaster. 



I have examined the following species which belong to this genus: Freyella 

 spinosa Perrier, elegans Verrill, insignis Ludwig, propinqua Ludwig, pacifica Ludwig. 

 H. L. Clark 8 has reported F. tuberculata Sladen from 2,320 fathoms, eastern tropical 

 Pacific, and has added the following new species from the same region: F. brevispina, 

 octoradiata, and oligobrachia. 



Without knowing the disposition of the gonads it is not possible to be certain that 

 the following species belong to Freyella: sexradiata Perrier, benthophila Sladen, 

 jragilissima Sladen, heroina Sladen, dimorpha Sladen, remex Sladen. F. bracteata 

 Sladen is a synonym of elegans according to Verrill. 



' Mem. Mus. Comp. Zoo]., vol. 29, 1920, no. 3, pp. 108-113, pis. 5, 6; the region is between 9° 2' S. and 0" 3' N. and 83" and 

 123° W. 



