ASTROPYGA PULVINATA. 



Fig. 1. 



each side, intercalated between them and the genital plates ; the madreporic 

 body is elliptical, quite prominent ; anal opening central, or nearly so. 



The ambulacral tentacles are provided with suckers on the actinal side, 

 from the actinostome to the ambitus. On the abactinal side they are pointed, 

 as in Diadematidae. Only one row of 

 suckers extends from the auricles to the 

 actinostome on each side of the ambulacra ; 

 there are no actinal cuts in the buccal mem- 

 brane, as in Cidaris. The auricles are low, 

 Fig. 2. slender, with wide auricular foramen. The buccal membrane is thickly 

 covered by short, club-shaped spines, and minute, short-stemmed, 

 small-headed pedicellariae. The spines of the primary tubercles are 

 curved, hollow, flaring at the extremity. A section of the primary 

 spines (PL II. f. o., Rev. Ech.) shows a structure similar to that of 

 the spines of Diadematidae. The secondary spines are less curved 

 and more cylindrical, while the smaller, thin, silk-like spines are 

 straight ; the miliaries of the whole surface of the test carry a num- 

 ber of large-headed, tripartite pedicellariae with long, slender stems 

 (Fig. i,) and a far greater quantity of similar pedicellariae, but with 

 smaller heads, probably the younger stages. In addition there are 

 a number of short-headed (Fig. 2) pedicellariae scattered over the 

 whole test, more numerous, however, on the actinal side. 



Astropyga pulvinata 



! ddarites pulvinata Lamk., 1816, A. s. V. 

 ! Astropyga pulvinata Agass., 1846, Cat. Rais. 



PI. I.f. 1, 2. 

 I have nothing to add to the descriptions of this species given by Mr. 

 Verrill * and myself, t As no figure of older specimens of this species cov- 

 ered with its spines has been published, I have given in PI. I.f. 1,2, views 

 from above and below of a specimen intermediate in size between those 

 figured in the Revision of the Echini, PI. III"./. 4, and PL IIP f. 4, 5 ; the 

 length of the spines of this specimen is in striking contrast with the length 

 of the spines of all the specimens of Astropyga radiata which I have thus 

 far seen. 



Panama ; collected by Lieutenant Cutts. 



* Veruill's Notes on Radiata, p. 296, 579. 



f A. Agassiz, Revision of the Echini, Part III. p. 418. 



