48 



BULLETIN 76, UNITED STATES NATIONAL MUSEUM. 



r=> mm • R = 2 r; breadth of ray at base 6 mm.; superomarginals, fifteen; larger 

 pa.xilia> about the' same as m foregoing specimens, but spinelets shorter and area 

 l.roa.ler- furrow spinelets usually three; actinal intermediate plates extendmg more 

 than one-thiril length of ray (nearly one-half); superomarginal plates more robust 

 than in foregoing example; terminal plate conspicuous. 



Type.— Cat. No. 2192.5, U.S.X.M. 



Type-hcahtij.— Albatross station 2862, near north end of Vancouver Island 

 (inside) m 238 fathoms, on gray santl and pebbles. 



Distribution. Southern part of Bering Sea to Vancouver Island and from 56 



fathoms in northern limit of range to 238 in the southern. Dwells on sand, pebbles, 



and soft mud. 



Specimens examined.— Sixioen from the following staticms: 



Specimens of Leptychaster pacificus examined. 



LEPTYCHASTER ANOMALUS Fisher. 



50, fin 



PI. 7, fig. 4; pi. 9, fis. 1; pl 



Leptychaster anomatus Fisher, Proc. Wash. Acad. Sci., vol. 8, Aug. 14, 190G, p. 115. 

 Glyphaster anamalvs Verhili, Amer. Nat., vol. 43, Sept., 1909, p. 554. 



Diagnosis. — Rays five. R = 27 mm.; r=1.6 r. Breadth of ray at base, 19 

 nun. Usual form stellato-pentagonal; disk broad, rays short, broad, and blunt; 

 uiterbrachial arcs shallow and wide; general form depressed; abactinal surface 

 subplane, capable of slight inflation; actmal surface slightly arched due to rays 

 bonding upward; marginal plates conspicuous, few m number, devoid of any 

 enlarged spines or specialized armature, but covered with short spinelets; actinal 

 intermediate areas broad; adambulacral plates with three or four furrow spinules, 

 and on actinal surface with three longitudinal series of smaller spinelets, decreasing 

 in length toward outer edge of plate; small superambulacral plates present; a very 

 small anal pore present. 



Description. — Abactinal paxillar area compact; paxilla; arranged in not very 

 regular oblique transverse rows at sides of ray ; without order in median radial area 

 and center of disk. Paxillar largest at ba.se of ray and m mterradial areas, decreasing 

 conspicuously in size toward center of disk and tip of ray; larger at sides of paxillar 

 area than in midradial region. Column of paxilla about as high as breadth of base, 

 flaring at summit, the largest crowned with a coordinate floriform group of about 

 f.,r(v .ir forty-five short, terete, often clavate, round-tipped spinelets; of these 



