288 Verrill, Notes on Radiata. 



of one OX' two of these plates transverse series of two or three or 

 more smaller plates connect this row with a similar row of larger 

 convex plates along the sides of rays, thus leaving oblong spaces 

 which are occupied by numerous pores. Three other longitudinal 

 belts of similar poriferous spaces, alternating with rows of convex 

 plates, occupy the sides of the rays, while along the dorsal median 

 line there is a broader, irregular, often double row of larger and more 

 iri'egular plates. 



The whole surface, above and below, is covered by coarse, short, 

 convex granulations, with other minute ones intervening. Sessile 

 pedicellario3, with oval openings, scarcely raising above the granules, 

 are scattered on the lateral plates, and numerous smaller ones occur 

 among the pores. They often have the slit divided across the middle, 

 so as to appear double. 



Color, in alcohol, dark grayish or yellowish brown, when dry, often 

 tinged with purplish brown above. In life variegated above with 

 purple and brown. 



Mithrodia Bradleyi Verriii, sp. nov. 



Disk small ; rays five, round, elongated, not rigid ; dorsal surface 

 coarsely reticulated and covered with numerous, small, scattered, 

 papilliform spines, and with a median and about three lateral rows 

 of large, stout spines, roughened, like the small ones, with small 

 spinule-like granulations. 



Radii as 7 : 1. Length of rays from the center 4*3 inches ; radius 

 of disk -6 ; width of arms at base "6, somewhat enlarged farther out ; 

 length of longest spines '25, diameter 'OB. The interambulacral plates 

 bear an inner row of very slender, small, sharp spines, from live to 

 seven to each jjlate, the middle ones longest, forming rounded clusters, 

 in which the spines are connected together by a web to the ends ; and 

 close to these, on the outside, a simple series of much longer, stout, 

 round, strongly granulated spines, one to each plate, most of which 

 have enlarged tips. Outside of these the ventral and lateral parts of 

 the rays are openly and coarsely reticulated and bear, on each side, 

 three irregular rows of large, distant spines, those of the first row, 

 near the interambulacral spines, shorter and more numerous than the 

 others, which are separated by distances about equal to their length. 

 All these spines are movable at base, and are round, somewhat taper- 

 ing, obtuse or rounded at the ends, and covered with closely crowded, 

 coarse, elongated grains, which become longer and more spiniform at 

 the tips of the spines. The dorsal surface of disk and rays is less 

 firm, and more finely reticulated, bearing very numerous, scattered. 



