Verrill, Notes on Radiata. 276 



tral acute spine, rising above the general surface. Madreporic plate 

 larji'e, very near the marginal plates. 



Length of rays from center of disk 3 inches ; to edge of disk -6 ; 

 width of rays at base -65 ; of central, dorsal area -4 of an inch. 



Panama, — F, II. Bradley. 



A small specimen in the collection of the Smithsonian Institution, 

 apparently belonging to this species, collected at Cape St. Lucas 

 by J. Xantus, presents the following peculiarities : Radius of rays 

 1 inch, of disk 'S. The rays have the same form as in the ])receding. 

 The upi)er marginal plates are narrow and rather high, formed as in 

 the large specimen ; there are 20 on each side of the rays ; the two 

 occupying the intcrradial angle bear, each, a single long sharp spine ; 

 the next three or four bear two smaller si)ines, while the remain- 

 ing plates, even to the end of the ray, bear a single small sjjine. 

 The lower marginal plates are closely granulated and each usually 

 bears five or six spines, of which the three lower are short and sharp, 

 and the two upper long, round, sharp, and somewhat bent, resembling, 

 except in size, those of the larger specimens. 



Dr. Liltken's specimens are intermediate in size between the two 

 preceding, and differed from the large specimen, above described, 

 chiefly in having the inner row of upper marginal spines confined to 

 the inner three to eight plates, instead of extending nearly to the tip 

 of the rays. 



Astropecten Peruvianus Verriii, sp. nov. 



Rays narrow, elongated, acute, with the angle between somewhat 

 rounded. Greatest to least radii as 5 : 1. In a specimen two and a 

 half inches from the center to tip of rays there are 34 marginal plates. 

 Interambulacral plates each with three slender spines at the inner 

 margin, of which the central is much the longest ; exterior to these each 

 plate bears a somewhat stouter, blunt spine, of about the same length, 

 and several very small spines. The lower marginal plates project but 

 little beyond the upper, each bearing about five small, sharp spines, 

 the three lower being shorter than the inner intei-ambulacral, the two 

 upper considerably longer and larger (about •! of an inch long). The 

 upper marginal plates bear, each, a small conical spine at the inner 

 edge, and several of those toward the ends of the rays have also a 

 very small spine on the central part. Dorsal area of the rays narrow, 

 depressed at the middle of the ray, somewhat exceeding the width 

 of a marginal plate. Madreporic plate small, about its own diameter 

 from the marginal plates. 



Length of rays, from center, 2-5 inches; to edge of disk -5 ; width 

 of rays at base '5 of an inch. 



