10 BULLETIN 76, UNITED STATES NATIONAL MUSEUM 



In the foregoing description all the comparisons have been with L. 

 arctica, but hylodes resembles, as closely, the arctic L. hyperborea. This species is 

 rare, poorh understood, and usually confused with L. millleri. L. hylodes re- 

 sembles hyperborea in having very numerous, close-set abactinal spines among which 

 the carinal series is not readily distinguishable. It differs in the form of the straight 

 pedicellariae (which are rarely present in hyperborea), and in the form of the crossed 

 pedicellariae. (Comparepl. 11, figs. 1, N/. with pi. 10, figs. 5, 6, 9.) When compared 

 side by side w itb hypi rborea, the rays of hylodes are seen to be thicker and shorter and 

 the abactinal spinelets much more numerous and shorter. 



LEPTASTERIAS ORIENTALIS Djakonov 



Plate 11, Figures 2, 2a 2k; Plate 19, Figures 2, 3; Plate 20, Figure 3 

 Leptaslerias orientalis Djakonov, Neue Seesterne aus dem Ochotskischen Meer. II. Lep- 

 tasteriaa oriental ix sp. n., Coinpt. Rend. Acad. Sci. U. R. S. S., 1929, p. 277. 



Diniinosis. — Rays five, of medium stoutness, tapered, slightly swollen at base; 

 disk small; spinelets slender, tapered, with heavy wreaths of pedicellariae, rather uni- 

 formly and closely placed, but without longiserial order except on sides and actinal 

 surface. Differing from L. hylodes in having much more numerous crossed pedicel- 

 lariae, especially abactinally; less numerous abactinal spinelets; and in having more 

 numerous shank teeth on the jaws of the crossed pedicellariae. Differing from 

 /,. hyperborea in the form of both crossed and straight pedicellariae and in the greater 

 abundance of the crossed pedicellariae. K 55 mm., r 9 mm. R = 6r; breadth of ray 

 at base, 13 mm. 



Description. Spinelets slender, tapering, pointed, less numerous, longer, and 

 with conspicuously larger circumspinal clusters of pedicellariae than in hylodes. 

 Anoss the abactinal area, at base of ray, 13 to 15 spinelets can be counted. The 

 wreaths touch one another and neither the carinals nor dorsolateral spines (except 

 adjacent to superomarginals) form longiseries. Papulae singly or in groups of two or 

 three emerge between the spinelets. 



The marginal and actinal spinelets are longer than the dorsolateral and are clad 

 in heavy stoles of pedicellariae, which on the actinals are on the outer side of the spine. 

 One series of actinals extends nearly to end of ray while a second occupies the basal 

 third. Only one series is present in the specimen from station 5024. 



First six or seven adambulacrals monacanthid; then irregularly monacanthid 

 and diplacanthid; then monacanthid on outer half of ray (mostly monacanthid 

 throughout on small example). The furrow spines of alternate plates are set a little 

 further [urrowward, giving the appearance of two series of spinelets along the margin, 

 or even three on the basal half of the ray. Spines with heavy cluster of crossed pedi- 

 cellariae. 



The apertures of the gonoducts are marked by two prominent papillae in each 

 actinal interradial area (near the sixth or seventh adambulacral plate), usually 

 guarded by a large straight pedicellaria. 



Mouth plates with one slightly curved, tapered, blunt actinostomial spinelet 

 about as long as median suture and carrying one or two lanceolate straight pedicel- 

 lariae; and one suboral, longer straight spinelet similar to the adambulacral spines. 



