EASTERN TROPICAL PACIFIC ASTEROIDEA. 111 
but heavier than in that species; beyond genital area, they rapidly assume an 
ordinary blunt tip; where longest they are about 5 mm. long and decrease in 
length and stoutness distally. Inferomarginal spines at first rather small, not 
equalling the actinal adambulacral spines, but distally they gradually come to 
exceed them; as usual there are two actinal spines to one inferomarginal, the 
latter overlying one of the former. Both actinal and inferomarginal spines are 
more or less completely encased in pedicellariae-covered skin. Tube-feet very 
large, the pore occupying nearly the whole area bordered by the adambulacral 
plate. Oral plates small, with no midradial keel; at distal outer corner is a 
small spinelet similar in position and appearance to the adambulacral furrow- 
spine, while on the adoral margin are two similar but longer spines which widely 
diverge from each other; at the center of the actinal surface of the plate is a long 
spine, like the adambulacral actinal spines, with a conspicuously flat dentate 
tip; all the oral spines carry numerous pedicellariae. Color, in alcohol, light 
buff. 
Station 4649. Eastern Tropical Pacific, 5° 17’ S., 85° 19’ 30” W., 2,235fms. Bott. temp. 35.4°.  Fne. 
stky. gy. m. 
Station 4740. Eastern Tropical Pacific, 9° 2’ S., 123° 20’ W., 2,422 fms. Bott. temp. 34.2°. Dk. gy. 
glob. and rad. oz. , 
Station 4742. Eastern Tropical Pacific, 0° 3’ 29’ N., 117° 15’ 48” W., 2,320 fms. Bott. temp. 34.3°. 
Fne. It. gy. glob. oz. 
Three specimens. 
Two of these specimens are of nearly equal size but the one from St. 4740 is 
-very much younger. The disk is only 7 mm. across; two of the arms are broken 
near the disk, the others near their tips or beyond the genital area, which is little 
enlarged. None of the adambulacral actinal spines show very much expanded 
tips but they are relatively short and in view of the number of rays, I consider 
this specimen octoradiata. 
The small number of rays, apparently quite constant, the large feet, the 
short, thick adambulacral plates, and the relatively short actinal and inferomar- 
ginal spines combine to give this species a very characteristic facies. The disk 
too is relatively small and the rather stout arms are longer than usual. The 
generic characters are well shown, as there is no syzygy at the base of the arm, 
the genital tufts are single on each side of the arm and the interradial angle is 
as in microplax except for the very much larger interradial plate. 
