1082 
BULLETIN OF THE UNITED STATES FISH COMMISSION 
Color in life: Above, orange yellow with maroon blotches; below, light yellow. In alcohol, 
bleached grayish yellow or ashy. 
Locality: Station 4077, north coast of Maui Island, 99-106 fathoms, fine coral sand, foraminifera, 
bottom temperature 70°; 2 specimens. Type no. 21175, U. S. National Museum. 
Ophidiaster tenellus, new species. 
PI. xxxi, figs. 5, 5a. 
Rays 5. R=52 mm.; r=7.5 mm. R=7 r. Breadth of ray at base, 9 mm.; at middle of ray, 
5 to 5.5 mm. Height of ray at base, 6 mm. Rays 54 times as long as diameter at base measured 
along side. 
In general features resembling the preceding species, but with much longer and slenderer rays, a 
relatively coarser but uniform granulation, a very much thinner skin, 1 or 2 pores to each papular 
area, and fewer pedicellariae. The third or outer series of actinal intermediate plates is rudimentary. 
The plates are a trifle less prominent than in preceding species, but there is a perfectly evident 
though extremely fine transverse crack traversing the granulation between the plates. The longi- 
tudinal papular furrows are well marked but shallow. There are 6 rows of papulse, which are solitary 
or in twos (rarely 3). No papulse on actinal surface. The granulation is fine and uniform but 
increases in coarseness on the actinal surface near the furrow, where the granules occasionally appear 
scale-like. As in the last species the plates on one ray are somewhat irregular in disposition near the 
extremity. Two- or occasionally 3-jawed pedicellarise form a series on the '.proximal third of ray at 
either side of the furrow just external to the outer adambulacral spinelets, and a similar series is 
present on the outer row of actinal intermediate plates and fewer on the 2 series of marginals. On 
abactinal surface pedicellarise are rare. 
The furrow spinelets are about equal in size, 2 to a plate, and slightly spaced. They are much flat- 
tened, truncate, a trifle broader at the tip than base, and the inner or furrow face has a very shallow 
groove running from end to end. The spinelets project a considerable portion of their length beyond 
the general level of the actinal surface of the plates. The actinal adambulacral tubercles are flattened, 
ovoid or obovoid, granuliform, bent away from furrow, and form a series just external to the furrow 
spinelets, so that only 1 series of granules intervenes between the 2. There is 1 of these tubercles 
to every third or fourth furrow spinelet, and they are not nearly so long as the latter. The granules 
of the adambulacral plates are larger than those of the actinal intermediate plates, into which they grade 
imperceptibly. 
Madreporic body circular, of moderate size, situated midway between center and interbrachial 
angle. Striations deep, irregular, branching, centrifugal. 
Color in life: Buff above, deeper ochraceous in the papular areas; below, cream color. In alcohol, 
ashy. 
Locality: Station 4100, Pailolo Channel, between Molokai and Maui Islands, 130-151 fathoms, coral 
sand, shells, foraminifera; bottom temperature 61°. 1 specimen, type no. 21177, U. S. National 
Museum. 
Ophidiaster rhabdotus, new species. 
PI. xxx, fig. 2; pi. xxxi, fig. 8. 
Rays 5- R=80 mm.; r=ll mm. R=7.3 r. Breadth of ray at base, 11 mm.; at middle of ray, 
8.5 mm. Height of ray at base, 8 mm. Ray 5 to 6 times as long as diameter at base, measured along 
side. Interbrachial arcs not very acute. Rays appear conspicuously fluted. 
In general form resembling the preceding species, but differing in having more regular and more 
convex abactinal and marginal plates, 8 instead of 6 rows of papular areas, and 4 pores (3 to 5) iftstead 
of 1 to the area; outer or third row of actinal intermediate plates reaching one-third length of ray, and 
granulation a trifle coarser. 
Marginal and abactinal plates form 7 regular convex series separated by 6 equally regular furrows 
containing the papular areas. At tip of some of the rays this regularity is completely interrupted. 
There is also a slight transverse furrow between consecutive plates, but this is not nearly so conspicu- 
ous as the longitudinal sulcus. In the granulation between consecutive plates there is likewise a fine 
transverse crack, which is sometimes bordered by slightly larger granules. The marginal plates are 
slightly larger than the abactinal, and very regular except at end of ray. Between the inferomarginal 
