296 BULLETIN 76, UNITED STATES NATIONAL MUSEUM. 



slenderer than in leviuscula; adambulacral plates with a single spinelet in furrow, 

 and with twenty-five to thirty spinelets on actinal surface, arranged in six or seven 

 series (with three or four to each) parallel to ambulacral furrow. 



description.— The following is the original description: 



R : r : : 64 mm. : 14, or 77 mm. : 15. R = 5 r. Breadth of ray near base about 

 19 mm. Rays somewhat tumid near base, but tapering quite rapidly to a rather 

 attenuate tip; somewhat narrowed at base, and with rather deep interbrachial 

 sulci. Plates of abactinal surface rather large and not closely crowded, the groups 

 of papulfe being much more numerous than in H. leviuscula or sanguinolenta. The 

 plates are irregularly rounded, or crescentic, -with the concave side toward the 

 center of the disk. They are ii-regularly scattered and show no evidence of 

 arrangement in rows, except along the sides of the rays, where they assume a longi- 

 tudinal arrangement. Near the tip of the ray, on each side, are three longitudinal 

 rows, the lowest of which consists of small plates lying close to the adambulacral 

 plates and running parallel to that series the whole length of the ray. The two 

 other rows consist of larger plates, and the lower of the two runs the whole length 

 of the ray parallel to the row of small plates. The upper one, however, diverges 

 from the lower about the middle of the ray and runs upward toward the abactinal 

 side of the disk, where it joins the corresponding row of the next ray. The narrow 

 triangular space between this upper row and the lower one is filled by three or four 

 short, irregular rows of somewhat smaller plates. Toward the tip of the ray the 

 plates of the three longitudinal rows are arranged in more or less regular transverse 

 series, but this arrangement is wanting near the base of the ray. Spinelets very 

 numerous on all the abactinal plates, rather longer and more slender than in 

 leviuscula, measuring 0.3 mm. in length. The abactinal plates are so much less 

 crowded and the spinelets are so much more numerous and slender than in leviuscula 

 that the surface does not appear granular, as it does in that species. Adambulacral 

 plates with a single, stout spine, 0.75 mm. long, high up in the groove, and with 

 twenty-five to thirty spinelets on the actinal surface. These spinelets are arranged 

 in six or seven scries parallel to the ambulacral furrow, with tliree or four spinelets 

 in each series. The spinelets on the edge of the furrow are largest, measuring 2 mm. 

 in length, and each successive series consists of smaller ones, the last series being 

 very small. They are aU closely crowded together. Madrepore plate single, 

 small (2 to 3 mm. in diameter), covered wth spinelets arranged in ten to twelve 

 rows, radiating from the center. Color of alcoholic specimens uniform dark gray, 

 with a slight yellowish tinge in some lights. 

 Type. — Probablj' lost. 

 Txj'pe-locality. — Probably Puget Sound, Wasliington. 



Remarks. — No specimens of //. spiculifera have been recognized in the collec- 

 tions which I have examined, so that I can add nothing to the original description. 

 The two types are supposed to be at Columbia University, but are temporarily 

 or permanently lost. If the locality were certain H. spiculifera might possibly 

 be considered an extreme variant of the form I have named multispina. But m 

 the collection of which spiculifera formed a part there were species evidently col- 

 lected somewhere south of the United States, so that I am not at all convinced that 

 spiculifera is really from Puget Sound. 



