74 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
radioles, When alive the bare spaces of the test are of a deep brownish violet, 
the primary spines reddish, and the miliaries greenish with brownish longitu- 
dinal bands. The sutures of the genital and ocular plates are marked by a 
sharp violet line and the genital system is comparatively bare and free from 
miliaries. 
Station No. 3369, off Cocos Island, 52 fathoms. 
Two new species of Porocidaris were dredged by the “ Albatross.” 
Porocidaris Milleri A. Ac. 
Plate IV. 
This species is closely allied to P. elegans collected by the “ Challenger.” Its 
radioles differ from those of the Challenger species in having finer serrations. 
The actinal system is marked for the prominent development of the interam- 
bulacral plates, while in P., elegans the actinal system is paved with ambulacral 
plates (Agassiz, Chall. Echini, Plate III. Fig. 3). The primary tubercles of 
this species are not crenulate as they are in the other species of the genus, but 
the species possesses the remarkable primary actinal radioles which are so char- 
acteristic of the genus. The median interambulacral suture is bare of miliaries, 
while in P, elegans the presence of the closely packed miliaries conceals the 
suture. 
Station No, 9, off Cape Mala, 465 fathoms. 
di “ 3360, off Cape Mala, 1672 fathoms. 
“ “ 3381, off Malpelo Island, 1772 fathoms. | 
pe “3399, off Galera Point, 1740 fathoms. 
66 [77 
3415, off Acapulco, 1879 fathoms, 
Porocidaris Cobosi A. Ac. 
Plate III. Figs. 2-5. 
This species is rendily recognized by its comparatively small actinal and 
abactinal system. The primary radioles recall those of the Atlantic species 
P. Sharreri. In the ambulacral zone the primary miliaries are larger than 
those surrounding the serobicular area of the primary tubereles in the interam- 
bulacral area, The primary mammary bosses are perforated and crenulated ; 
the scrobicular area is narrow. 
Station No. 3404, off Chatham Island, 385 fathoms. 
SALENID/E, Acass. 
Salenia miliaris A. Ac. 
Plate IL Figs 2-4. 
This species can at once be distinguished from its Pacifie congeners by the 
great size of the anal system, which is irregularly hexagonal aud covered with 
