640 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 43. 



lari^e; third inferomarginal longer than wide as seen from below. 

 R = 76.5 mm., r=17 mm., R = 4.5 r; breadth of ray at mid-inter- 

 brachium, 19 mm. 



Tijpe.—Cat. No. 30549, U.S.N.M. 



Type-locality. — Station 5491, between Leyte and Mindanao, 736 

 fathoms, green mud, coral; bottom temperature, 52.3° F. 



NYMPHASTER ATOPUS, new species. 



Differing from other species herein described in having only 4 

 interbrachial superomarginals ; rays slender, the width at outer end 

 of second superomarginals (which corresponds in position to the inner 

 end of the first pair of plates which meet medially, in other species) 

 equaling length of first 3 superomarginals measured on ambitus; 

 superomarginals longer than wide; inferomarginals on ray very 

 slender, resembhng terete rods placed end to end; marginal granu- 

 lation relatively coarse, spaced; abactinal plates small, roundish 

 hexagonal, with few granules; oral spines 9 or 10; adambulacral 

 furrow spines proximally 7 or 8, then 10 or 11; apophysis is promi- 

 nent from the third plate on; distal plates much longer than wide, 

 with 1 series of granules and a few extra in the angle of the apophysis ; 

 about 15 or 16 adambulacrals corresponding to 10 inferomarginals of 

 ray. Cotype, 11 = 43 + mm., r = 9 mm., R = at least 5 r (tip of ray 

 broken) . 



Type.— Cat. No. 30550, U.S.N.M. 



Type-locality. — Station 5428, wSulu Sea, off Palawan (lat. 9° 13' N.; 

 long. 118° 51' 15" E.), 1,105 fathoms, gray mud; bottom tempera- 

 ture, 49.7° F. 



CERAMASTER SMITHI, new species. 



In general appearance closely resembling C. clarlci Fisher but differ- 

 ing in having less elevated abactinal plates, with shorter and differently 

 formed basal lobes; more num.erous granules, especially on center of 

 tabulum ; smaller pedicellariae ; coarser and characteristically formed 

 subambulacral spines. General form arcuately pentagonal, produced 

 at the corners into short blunt rays; body thin; margins thin, the 

 plates being small as in C. clarlci; abactinal plates very short lobed 

 and with hexagonal crowns on papular areas, composed of 10 to 18 

 central and 15 to 22 peripheral, subequal, slightly spaced granules, 

 and often a small, spatulate, 2-jawed pedicellaria ; superomarginals 

 longer than wide and with slightly spaced, flat, granules, except the 

 last few plates which are wider than long and have a bare area; 

 adambulacral plates with 4 or 5 coarse furrow spines and 3 coarser 

 truncate subambulacral spines, the tips truncate and curiously etched 

 out, pitted, and wrinkled, the grooving extending down the outer 

 side; oral spines, 8 or 9. R =60 mm., r = 31 mm., R =neariy 2 r. 



Type.—C&t. No. 30551, U.S.N.M. 



