NO. 2022. NEW 8TARFISHE8 FROM THE PHILIPPINES— FISHER. 205 



areas, and sometimes also intermarginally, and on actinal surface of 

 intermarginals. 



Type.— C&t. No. 32626, U.S.N.M. 



Type-locality. — Station 5467, Lagonoy Gulf, southeastern Luzon, 

 480 fathoms, green mud. 



As indicated above this species closely resembles P. mimicus, from 

 which it differs in having only 13 adambulacrals to the first 10 infero- 

 marginals, whUe mimicus has 15 to 18. In mimicus the abactinal 

 spines are absent from the lateral portions of the area, while in 

 liylacanthus they are distributed all over the area. P. mimicus 

 inhabits depths of from 692 to 1,092 fathoms, subjected to a tem- 

 perature of 36.3° to 39.5° F., while liylacanthus is found in less than 

 500 fathoms, the only temperature record being 44.3° F. 



This species closely resembles a species of Cheiraster which I have 

 identified as niasicus Ludwig, the two occurring together. Both 

 have fasciculate pediceUarise. In liylacanthus the superomarginals 

 are more lateral m position, and the spine is nearer the upper edge of 

 the plate. The pedicellarise have blunter, broader jaws, and the 

 actinal intermediate pediceUarise of niasicus are generally pectinate — 

 that is, stand on two plates, although subcircular in shape. The 

 papularium of hylacantlms is more swollen and when examined from 

 the inner side the plates are seen to be more modified, especially in 

 the center of the area, and the area itself shows no sign of being two- 

 lobed. In niasicus the papularium is flatter and slightly two-lobed. 

 The superficial similarity of the two species is, however, very striking. 



CHEIRASTER LUDWIGI, new species. 



Near Cli. gazellx Studer, but with pectinate, superomarginal, 

 suture pedicellarise interbrachially and intermarginal pedicellarise on 

 the distal third of ray, in addition to very prominent actinal inter- 

 mediate pediceUariae; abactinal pediceUarise very rare; 1 supero- 

 marginal spine near middle of plate; 1 inferomargmal spine with 1 

 accessory spinule below it; adambulacral plates very prominent, 

 meeting in middle of furrow; furrow spines 8 or 7; 1 subambulacral 

 spine (2 distaUy); oral spines 7; suboral spines 2; 17 adambulacrals 

 to first 10 inferomargmals. K = 53 mm., r=9.5 mm., 11 = 5.5 r; 

 breadth of ray at second superomarginal, 9 mm. 



Abactinal plates only slightly elevated, the groups of small, sub- 

 equal, bluntly pomted or obtuse spinelets distinctly spaced, some- 

 times moie than the diameter of the group. No enlarged central 

 spine anywhere on the abactinal surface. The larger plates of disk 

 with 10 to 12 upright or slightly divergent spinelets; the smaller have 

 5 to 7, or upward of 10. On the ray 5 to 7 slightly slenderer spinelets 

 surround a single central one, or 3 to 5 form a simple group. 



