NO. 1944. NEW GENERA AND SPECIES OF STARFISHES— FISHER. 643 



Astroceramus. But the actinal intermediate plates are like those of 

 Iconaster and Lithosoma, being without central granules. The 

 adambulacral armature is similar to that of Iconaster while suggesting 

 Astroceramus in the slightly more differentiated inner subambulacral 

 series and in the presence of a conspicuous transversely oriented 

 pedicellaria. To put these facts in a different way: /. perierctus 

 differs from Iconaster in having the dorsal radial plates entirely 

 surrounded by granules, and in having the tumid superomarginals 

 roughened by uneven elevations (which, unlike those of Astrocera- 

 mus, do not have scattered granules). It differs from Astroceramus 

 in lacking any trace of marginal and enlarged central actinal inter- 

 mediate granules, in having the adambulacral armature graded from 

 the short furrov^^ spines to the outer granules, and in the absence of 

 a conspicuously enlarged subambulacral on the outer part of the 

 ray. 



ASTROCERAMUS LIONOTUS, new species. 



Similar in appearance to A. callimorphus but differing in having 

 less tumid margmal plates, especially on the ray, slightly smaller 

 abactinal plates, and very strongly compressed, bladelike, subtrun- 

 cate furrow spines; subambulacral pedicellarise slenderer and longer 

 than the actinal intermediate pedicellarise, not similar to them. 

 R = 79 mm., r = 22 mm., R =3.6 r; breadth of ray at inner end of first 

 pair of superomarginals which meet medially equal to length of first 

 3§ or 4 superomarginals measured on ambitus; thickness of disk 

 interradially equal to length of 1^ adjacent superomarginals. Abac- 

 tinal plates flat, smooth, except for minute hyaline bosses, and 

 bordered by small granules flush with the general surface; superomar- 

 ginal plates massive, increasing in size up to the third or fourth, which 

 meet medially; margin of ray forming an abrupt right angle, wdth 

 uneven elevations bearmg scattered deciduous granules, these 

 encroaching upon surface of plates interradially; a few marginal sugar- 

 tongs pedicellarige; mferomarginals slightly and unevenly tumid, with 

 upward of 30 deciduous granules; marginals bordered by a momli- 

 form series of small granules; actinal interradial areas very similar to 

 those of A. caUimorphus; furrow spines 4 or 5, compressed, and 

 widened at tip; subambulacral spines 2 or 3, heavy, with proximaUy, 

 between them a slender spatulate two-jawed pedicellaria; on outer 

 part of ray, subambulacral spine single and much longer than furrow 

 spines. 



Type.— Cat. No. 30555, U.S.N.M. 



Type-locality. — Station 5523, 6.7 miles northeast of Point Tagolo, 

 northern Mindanao; depth and bottom not recorded. 



