ASTEROIDEA OF NORTH PACIFIC AND ADJACENT WATERS — FISHER. 305 



is largely obliterated by the growth of the secondary intermediate plates to nearly 

 or quite the coarseness of the primary. Tliis gives a finer-meshed appearance to 

 the abactinal surface. Two young specimens from station 2992 are remarkable in 

 having tlirec or four spinelets in a vertical series on the furrow face of the adambu- 

 lacrals and fewer adambulacral spinelets, of whicli those near t)>e furrow arc abruptlv 

 much larger than the outer ones; the last is true also of the s[)ecimens from 2935 

 and 2923. In tliese specimens the s])inelets near the furrow edge (tiiree to five) arc 

 relatively larger than the outer ones, than is the case in the type-specimen. They 

 are thus more like pauperrima, but that species has square adaml)ulacral plates and 

 more numerous abactinal spinelets; this species has the spine-bearing surface of the 

 adarabulacrals wader than long. The specimens from 2992 (Revillagigedo Islands) 

 are too young to make tlieir identification with this species certain; tiiey are, how- 

 ever, nearer this form than to prtupernvia, or anv described species. 



Type.—C&t. No. 27785, U.S.N.M. 



Type-local'dii. — Albatross station 4427, of! Santa Cruz Island, California, 475 to 

 510 fathoms, black mud, broken stones; one specimen. 



Distribution. — Santa Cruz Island, California, to the lievillagigedo Islands, 

 Mexico, 124 to 822 fathoms. 



Specimens examined. — Besides the tj^^e, four from the following stations: 

 2992, Revillagigedo Islands, off Mexico, 460 fathoms, black sand, rocks, two; 2923, 

 off San Diego, California, 822 fathoms, green mud, one; 2935, same locality, 124 

 fathoms, fine gray sand, one. 



liemarhs. — Ilenricia chrlci difTers from H. polyacantha (wliich it resembles 

 in having more than one furrow spinclet and numerous adambulacral spinelets) 

 in the form of the abactinal skeleton, in having the ])upuhe very irregularly arranged, 

 in having no distinguishable series of marginal plates, in having much larger and 

 more conspicuous mouth plates. The spinelets are longer and sharper. From //. 

 pauperrima, of the Hawaiian Islands, to which clarH bears considerable outward 

 resemblance, the species difTers in having more numerous adambulacral spinelets, 

 and oblong instead of square adambulacral plates. In pauperrima there is an imli- 

 cation of the characteristic skeletal structure of clarhi, but the primary meshes 

 are smaller and do not inclose numerous secondary' plates. 



Tliis species is named for Mr. Austin Hobart Clark. 



Family SOLASTERIDiE Perrier, 1884, emended. 



Spinulosa with a more or less open and irregular reticidate abactinal skeleton 

 (though exceptionally with small roundish or irregular independent plates), the 

 plates bearing jjaxilliform groups of spinelets; marginals paxilhform, in one or two 

 seri&s; adambulacral spines in a furrow comb and a series at right angles to this; 

 actinal intermediate plates present; with iutcrbrachial septa; no pedicellaria? ; no 

 supradorsal membrane; anus present; tube feet in two series with well developcil 

 sucking disks. 



57444°— Bull. 7(>— H 20 



