336 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



of the pedicellaria (where these are numerous) or take the place 

 of 1 or more of the pedicellariae. When there is only the adoral pedi- 

 cellaria it replaces the others entirely. On the outer part of the 

 furrow one of these spines is enlarged (or 2 in a transverse series) 

 and becomes tapering and pointed, and is conspicuously longer than 

 the furrow spines. The outer margin of the plate has several un- 

 equal granules. In this species the subambulacral pedicellariae are 

 much more numerous than in efvxanthus^ while the furrow spines 

 are more delicate and compressed. 



Mouth plate convex actinally as in epixanthns and other members of 

 the genus. Marginal spines in a slightly convex series of 13 to 15 

 (9 to 11 in epixanthus) similar to the adambulacral spines except the 

 inner 3 which very rapidly increase in size and become compressed, 

 round-tipped, or truncate teeth. The spines are webbed for about half 

 their length. Back of the furrow spines is a row of upward of 6 

 pedicellariae similar to the subambulacral pedicellariae, the rest of 

 the plate being covered with spaced coarse hemispherical or some- 

 times acute gi-anules. In small specimens only 1 or 2 pedicellariae 

 may be present. 



Madreporic body variable in size, fairly large, nearly flat, irregu- 

 larly roundish, situated a little more than ^ r from center. Striae 

 fine, radiating, and branched. 



The gonads are arranged in a series of 6 to 8 tufts on either side 

 of and parallel to the membraneous interbrachial septa. 



Type.— C^t. No. 30559, U.S.N.M. 



Type-locality. — Station 5626, between Gillolo and Kayoa Islands,. 

 Molucca Islands, 265 fathoms, gray mud, fine sand; 1 specimen. 



Distrihution. — Molucca Islands, 265 to 288 fathoms. 



Specimens examined. — Five in addition to the type : Station 5622, 

 between Gillolo and Makyan Islands, 275 fathoms, gray mud, 1 speci- 

 men ; station 5624, same locality, 288 fathoms, fine sand, mud, 4 speci- 

 mens. 



ANTHENOroES LITHOSORUS Fisher. 



Plate 89, fig. 2 ; plate 90, fig. 2 ; plate 94, fig. 6, 6a-c. 



Anthenoides lithosorus Fisher, 1913fl, p. 647. 



Diagnosis. — Closely related to A. granulosus, but differing in hav- 

 ing the coarse superomarginal granules confined to the center of plate, 

 surrounded by a conspicuous area with only spaced microscopic 

 grains ; abactinal granules fine, subequal, thick on center of disk, be- 

 coming smaller and more spaced as the margin is approached, fewer 

 than in granulosus, smaller, and the central granules of the plate not 

 larger than the others ; superomarginal plates more tumid, the width 

 remaining the same to within 4 or 5 plates of end of ray (regularly 

 decreasing in length in granulosus) ; furrow spines 9 or 10 ; oral spines 



