544 ENCOPE. 



posterior interambulacral space, where the digitatious are longest, gradually 

 diminishing in .size towards the anterior lateral ambulacra, where they are 

 reduced to mere indentations. The digitatious are longest in the prolonga- 

 tion of the two inner sides of the posterior ambulacra ; the two median 

 interambulacral ones corresponding to the odd interambulacral space are 

 usually slightly shorter. The mode of formation and order of appearance 

 of the digitatious appear identical with that described in R. Augusti ; in 

 very small specimens we find on the edge, seen from the lower side, traces 

 of the three posterior median interambulacral notches. 



The tuberculatum of the abactinal surface is closer than in R. Augusti ; 

 the miliaries are less numerous, and on the actinal surface, though the tuber- 

 cles are larger, there is by no means so striking a contrast in the tubercula- 

 tion of the two sides. The actinostome is small ; the anal system nearly 

 circular, smaller than the mouth ; the furrows are less deep and less marked 

 than in 11. Augusti, but branch very much as in that species. 



Though the specimens of R. Rumphii to which I have had access had lost 

 their spines, they were not so completely bleached as those of R. Augusti. 

 and retained their color to a certain extent. They were of a bluish-green 

 on the upper side ; the lower of a lighter green, mottled with yellow, along 

 the furrows and sutures. 

 Senegal; Cade Verde Islands. 



ENCOPE. 



Encope A.GASS., 1840, Cat. Syst. Etyp. 

 (See Part II. p. 32J.) 



Encope californica 



! Encojx californica VeRRILL, 1870, Sill. Jour., p. 97. 



This species and Encope grandis represent on the west coast Encope Miche- 

 lini ; it has, like Encope Michelini, its vertex immediately anterior to the 

 interambulacral lunule. The outline is rounded anteriorly ; the greatest 

 diameter half-way between the apex and the posterior edge; the poster. or 

 edge is frequently somewhat rounded or truncated. The apical system 

 is nearly central. The petals are regularly elongate, rounded anteriorly; 

 the anterior pair is the shortest, with proportionally widest interporil'erous 

 space. The posterior pair are longer than the odd petal, and are not curved. 



