404 PBOCEEDINaS OF THE NATIONAL MUSEUM. vol. xxxvi. 



Pi large and stout, but becoming slender distally, strongly flattened 

 exteriorly; following pinnules decreasing rapidly in stoutness, and 

 somewhat in length ; distal pinnules stout, strongly prismatic, longer 

 than Pi. 



Color. — Yellow. 



Genotype. — Crotalometra eupedata. 



CarjDenter's Antedon valida, the systematic position of which has 

 puzzled me greatly, belongs to this genus, and is closelj^ related to 

 C. eupedata, though apparently perfectly distinct; Antedon incerta 

 also should be referred to this genus. The Antedo7i magnicirra 

 described from South Africa by Professor Bell is likewise a member 

 of this genus, and I have examined two or three additional species 

 from the East Indian region. 



CROTALOMETRA EUPEDATA, new species. 



Centro-dorsal large, conical, 5 mm. long and 5 mm. broad at the 

 base, the bare polar area forming the apex of the cone ; cirrus sockets 

 arranged in ten columns, one at the outer side of each radial area, so 

 that the cirrus columns of adjacent radial areas are in close apposi- 

 tion, the two columns in each area being separated by a space about 

 equal to their own width; one or two cirrus sockets to each column, 

 usually succeeded by one or two obsolete and more or less obliterated 

 ones. 



Cirri X-XX, GG, 90 mm. long; first three joints two and one-half 

 times as broad as long ; fourth twice as broad as long ; fifth half again 

 as broad as long; sixth slightly longer than broad; seventh a transi- 

 tion joint, dull in the anterior three-fourths, highly polished and flat- 

 tened in the distal fourtli, not quite twice as long as broad ; eighth to 

 eleventh or twelfth joints about twice as long as broad, then grad- 

 ually decreasing in length, becoming squarish about the twentieth, 

 and. twice as broad as long distally; after the fifteenth joint, the distal 

 dorsal edge begins to project slightly, though this is scarcely notice- 

 able until the twentieth is reached, after which it increases in height, 

 becoming more sharply rounded in end view, and arises gradually 

 from the whole dorsal surface of the joint, so that the dorsal profile 

 of the terminal third of the cirrus is strongly serrate ; opposing spine 

 a blunt tubercle, the apex subterminal, arising from the whole dorsal 

 surface of the penultimate joint; terminal claw very long and slen- 

 der, twice as long as the penultimate joint, only slightly curved; all 

 the cirrus joints have the distal ends all around slightly projecting 

 and very finely spinous, making the cirri rough to the touch; this 

 projection is slightly more marked on the ventral side than laterally. 



Disk covered with small plates, very thickly set near the ambulacra, 

 but becoming more scattered toward the periphery in the inter- 

 ambulacral areas; disk ambulacra lined with large regular plates; 



