MUSEUM OF COMPARATIVE ZOOLOGY. 187 



nulce 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° 3G' N., Long. 84° 5' W. 955 fms. 



Salenia Pattersoni A. Ag. spec. nov. 



Plate V. 



This is the most exquisitely colored of the living Salenida; 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 Coelojjleurus. 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 (PI. 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 papillae 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- 

 laria. The plates of the abactinal system are covered by a coarse granulation, 

 which, towards the outer edge of the genital p,q ^ 



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- 

 j(jining 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 pri- 

 mary tubercles in the interambulacral area. The secondary tubercles, carry- 



* Vide A. Agassiz, Hcv. Echini ; bovEN, S. Echinoidees ; Dl-xcan, M. P. Ann. 

 and Mag. 1878 ; Wyv. Thomson, Voyage of the Chall'ngcr. 



