SEA LILIES, STARFISHES, ETC.—CLARK. 55 
are evident, especially on the sides of the arms. The super- 
ficial appearance of alcoholic specimens of Pseudophidiaster is 
more like that of Phataria than like that of Ophidiaster, but 
the latter genus seems to be structurally more nearly allied. 
PSEUDOPHIDIASTER RHYSUS,! sp. nov. 
(Plate xvi., fig. 1-2.) 
R50 mm. t—=25 mm. R=6r. . Br=27 mm.:> KR—not 
quite 6 br. Br at middle of ray, about 15 mm.; at tip, 3-4 
mm. Disk large, considerably elevated, the median radial 
series of plates extending outward from it in equally elevated 
ridges ; rays therefore more or less distinctly trigonal at base, 
but tapering quite uniformly to a cylindrical, bluntly pointed 
tip. Whole animal clothed in a thick skin, bearing a dense 
coat of crowded granules, and concealing almost completely 
the skeletal plates ; on papular areas, there are 60 or more 
granules per square millimeter, but on convexities and eleva- 
tions of disk and base of rays, the granulation is much coarser, 
sometimes only 4-10 per square millimeter. Median radial 
series of abactinal plates very conspicuous proximally, but 
becoming less and less distinct distally ; on each side is a much 
smaller series which, beyond the middle of the arm, becomes: 
irregular and difficult to distinguish ; then comes the series: 
of superomarginals which are quite well marked except near 
tip of ray ; inferomarginals as large or larger, and generally 
easily followed to very tip of ray, since they form the ventro- 
lateral margin of the arm. Papular areas rather small, each 
with 20-25 ‘papule, forming eight regular series, one on each 
side of arm being actinal in position, below the inferomarginal 
plates ; distally ‘the series are less regular and the actinal do. 
not reach the tip of the arm. Madreporite very large and 
conspicuous, 10 mm. long by 8 mm. wide. Terminal plate 
very small and inconspicuous. 
Actinolateral plates in three regular series proximally, with 
a few plates indicative of a fourth series; the third series 
disappears about one-third of the distance from mouth to 
arm tip ; the second extends beyond the middle of the arm ; 
the series adjoining the adambulacrals apparently extends 
nearly to the arm tip. Adambulacral armature of 2 flattened, 
smooth spines nearly 2 mm. long, with blunt, rounded tips, 
placed close together, the aboral the slightly smaller of 
1. pucos=wrinkled, shrivelled ; in reference to the appearance of dry 
specimens. 
