MUSEUM OF COMPARATIVE: ZOOLOGY, 187 
mide thus far described * they at least all agree in having an ocular plate 
opposed to the median line of the subanal plate, the adjoining genital plates 
uniting just in front of this imaginary median line to separate the ocular plate 
more or less from the anal system. 
Station No. 29. Lat. 24° 36/ N., Long. 84° b! W. 955 fms. 
Salenia Pattersoni A. Ac. spec. nov. 
Plate V. 
This is the most exquisitely colored of the living Salenide thus far found. 
When alive the test is of a light cream-color, as well as the shafts of the pri- 
mary spines. These are banded with brilliant vermilion, the cream-color and 
vermilion nearly equally divided. This coloring, at first glance, gives to this 
species very much the appearance of the Florida species of Colopleurus. The 
secondary spines are also cream-colored, but separated at the base by dark 
violet lines, extending from the apical system in the median ambulacral and 
interambulacral line to the actinal system. Similar dark violet lines separate 
the genital plates and the superanal plate from one another, the dark lines of the 
median interambulacra and ambulacra extending some distance into its corre- 
sponding genital and ocular plates (Pl. V. and Fig. 1). The primary spines are 
from three to four times the diameter of the test, with minute, sharp, irregular 
serrations. These are frequently worn, and the radiole presents a nearly smooth 
surface, slightly granular, The primary spines of this species are remarkably 
uniform in their appearance, differing merely in length, as mentioned above, 
but we find nothing of the great variation in the spines characteristic of S. va- 
rispina. The papilla or secondary spines are long, with rounded ends slightly 
concave at extremity. The outer edge of the abactinal system and the median 
line of the ambulacral area are thickly studded with minute globular pedicel- 
lario. “The plates of the abactinal system are covered by a coarse granulation, 
which, towards the outer edge of the genital Fro. 1. 
plates, becomes minute sessile spines, The 
sutures between the genital plates are deep, as 
well as the lines separating them from the abac- 
tinal part of the ocular plates. The anal sys- 
tem carries short, stout, pointed spines, None 
of the genital pores are very distinct, with the 
exception of the one carrying the madreporic 
body, which consists of a few minute holes ad- 
joining the large genital pore. The ocular plate 
opposite the superanal plate nearly touches 
the anal system, far nearer than in S. varispina. 
In a specimen of the one of the size figured in Plate V., there are five prj- 
mary tubercles in the interambulacral area, The secondary tubercles, carry- 
* Vide A. Agassiz, Rev. Echini; Loven, S. Echinoidées ; Duncan, M. P. Ann, 
and Mag. 1878 ; Wyv. Thomson, Voyage of the Challenger. 1 
