SALENIA PATTERSON r. 
13 
The abactinal system (PI. IV. Fig. 2), which is but sparsely covered by 
papilloe, is remarkable for the size of the anal system, comparatively larger 
than in the other species of the genus, and for the elongate genital and 
ocular plates. 
The primary radioles are smootli, and uniformly tapering ; in one of the 
specimens, which was of a light greenish pink color when alive, the spines 
are white with a delicate brownish-pink base. In the other large specimen 
they vary greatly in shape, from the peculiar serrated, short, flattened spines, 
surroiinding the actinostome, characteristic of this genus, to long, slender, 
cylindrical spines, straight, or sometimes slightly cui'ved, equalling in length 
twice the diameter of the test, and finely fluted for the whole length, or 
to the shorter radioles, gradually becoming thicker towards the tip, with 
coarser fluting ; we also find some spines with slightly cupuliform tips, as in 
Goniocidaris. The largest specimen measures fully 72 nnn. in diameter. 
* Salenia Pattersoni A. Ag. 
Salenia Pattersoni A. Ao. Bull. M. C. Z., V., No. 9, Fig. 1, p. 187, PI. V., 1878. 
Salenia Pattersoni A. Ao. Bull. M. C. Z., VIIL, No. 2, p. 72, 1880. 
Off Havana, Caribbean, West Indie.i. 
PL IV. Figs. 3-a3; PI. V. ; PL VI. Figs. 18-23. 
Tliis is the most exquisitely colored of the living Salenidas thus for known. 
When alive the test is of a light cream-color. The shafts of the primary 
spines are banded alternately with cream-color and brilliant vermilion, the 
colors being nearly equally divided. This coloring at first glance gives to 
this species very much the appearance of the Florida species of Coelopleurus. 
The secondary spines are also cream-colored, separated at the base by dark 
violet belts, extending from the apical to the actinal system along both the 
median ambulacral and interambulacral lines. Similar dark violet lines 
separate the genital plates and the superanal plate from one another, the 
dark lines of the median ambulacra and interambulacra extending some dis- 
tance into their corresponding genital and ocular plates. The primary spines 
are from three to four times in length the diameter of the test, and carry mi- 
nute, sharp, irregular serrations ; these are frequently worn off, the radiole 
then presenting a nearly smooth surface, slightly granular. These spines 
are remarkably unifornr in their appearance, differing merely in length, 
and we do not find among them the great variation so characteristic of the 
primary spines of S. varispim, the only exceptions being the Porocidaris- 
^Av 
