STARFISHES OF THE PHILIPPINE SEAS. 357 



nearer of a size; that is, the marginal granules are very coarse, while 



in tiiberculosus they are small. The adambulacral formula of tuber- 



7 . 6 (or 5) 6 (or 5). . , ... 4 (or 5) ^. , 



culosus IS ' ■ -. or — ^"T^j in elegans it is — ' , ' ■• The adam- 

 2+ 1 1 + 1 1 + 1 



bulacral pedicellariae found by Sladen in the Challenger' specimen 



of elegans do not appear to be present in the Albatross specimen. 



Type-locality. — Gray states that the locality is unknown, but Per- 

 rier (1875, p. 256) records the type as from northeast China. 



Distribution. — Philippine Islands and northeast China(?). 



Specimens examined. — Station 5481, 3.8 miles southeast Cabugan 

 Grande Island, Surigao Strait, east of Leyte, 61 fathoms, sand, 

 shells, gravel; 1 specimen. 



Station 5482, 4.5 miles southeast of Cabugan Grande Island, 67 

 fathoms, broken shells, sand, green mud ; 1 specimen. 



ASTERODISCUS HELONOTUS Fisher. 



Plate 95, figs. 1, la ; plate 96, figs. 1, 2. 

 Asterodisctis helonoUis Fishee 1913c, p. 210. 



Diagnosis. — Similar in shape and general appearance to A. trun- 

 catus Coleman, but differing in having smaller and more numerous 

 abactinal tubercles (of a similar form), much larger terminal supero- 

 marginal plate, less conspicuous marginal plates (the superomar- 

 ginals not distinguishable) ; more numerous inferomarginal plates, 

 9 underlying the terminal superomarginal, and others bearing a 

 large, compressed, fan-shaped tubercle ; flattened or spatulate actinal 

 intermediate spines near furrow, where they are larger than near 

 margin; only 3 furrow spines; outer subambulacral spine flattened, 

 and heavier than the inner (the reverse in truncatus) ; inner mouth 

 spines shorter than the others. R=98 mm., r=48 mm., R=2 r; 

 breadth of ray at base, about 53 mm. ; general form depressed, 

 strongly stellate. 



Description. — Abactinal tubercles similar in form to those of A. 

 truncatus., but much smaller and much more numerous. Larger 

 tubercles not arranged in evident series, in form resembling inverted 

 truncated cones, the base of the cone being convex, and the truncated 

 end immersed as it were in the plate and surrounded by a circle of 

 small beadlike granules. Packed closely among the largest tubercles 

 are more numerous smaller ones of several sizes, more numerous than 

 in A. truncatus. These are clavate, or obovate, more or less irregu- 

 lar in form, and toward the margin of the disk a certain number be- 

 come slenderer, and take on a more cylindrical form, with a well- 

 rounded summit. The secondary tubercles arc all considerably higher 

 than thick and all except the smallest have at least a few inconspicu- 

 ous granules around the base. The height of an average primary 



13434— Bull. 100—19 24 



