CLYPEASTER SUBDEPRESSUS. 513 



is brownish-gray, or mottled with yellow ; the spines on the edges of the 

 coronal plates are frequently of a light yellow color ; on the actinal surface 

 they are of a uniform brownish-pink tint. 



In general appearance this species resembles closely young E. rosaceus. 

 Tins resemblance extends, however, only to the exterior : when opened, we 

 find the test thin ; the whole actinal floor, except a third of the distance from 

 the edge and a small space round the actinostome, bristling with needle-like 

 pillars, leaving the principal passage from the intestinal canal adjoining the 

 edge of the test. Only the outer and the interambulacral pillars extend to 

 the abactinal floor ; the petals are entirely free, and connect directly with 

 the main intestinal cavity ; the floors of this species are single and not 

 double, as they are already in small specimens of Echinanthus. 



It is possible that this species may prove the young of a still unknown 

 adult Clypeaster, but thus far, in all collections I have examined, I have not 

 found any species of Clypeaster which could, from what we know of the 

 growth of our Atlantic species of Clypeaster, be supposed to be the adult of 

 these small specimens. The largest specimens I have seen measure only 

 48° 



Red Sea ; Philippine Islands ; Kingsrnills. 



Clypeaster subdepressus 



! Echinanthus subdepressus Gray. 1825, Ann. Phil., p. 5. 

 ! Clypeaster subdepressus Agass., 1836, Prod. 

 (See Part II. p. 306.) 



PL XP. ; PL XP.f. i-2 ; PL XP.f. 25; PL XII". f. 4; PL XIII f. 

 10 - is; PL XXV. f. 24, 25. PL XXIX; PL XXX. 



Florida ; West Coast of Africa. 



