204 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 8 



Pectinate pedicellariae very inconspicuous, flat, confined to the actinal 

 surface. One or 2 pedicellariae in each actinal interradial area, and up- 

 ward of 13 have been found on a ray between the adambulacral plates. 

 The margins of 2 adjacent plates each bear a comb of 5 to 7, straight, 

 broad, short, bluntly tipped, interlocking spinules. Pectinate pedicellariae 

 could not be found on all of the specimens. 



Madreporite body convex, striae radiate out irregularly. It is located 

 in the interradius about its own diameter (1 or 2 plates) from the supero- 

 marginal plates; surrounded and protected by 4 or 5 large paxillae. 



On the coelomic surface of the dorsal integument are 2 long, narrow, 

 strong muscle bands, extending from the basal portion to the tip of the 

 rays. Proximally they are separated, but on the distal third of ray they 

 join, continuing as a single band to the tip of ray. The proximal tendon is 

 from 8 to 10 mm. long. In the larger specimens the main portion of the 

 tendon is attached fanwise to the proximal side of the crest of the promi- 

 nent ninth or tenth ambulacral ossicle. The attachment is not noticeably 

 fanwise in the smaller specimens. Small lateral tendons branch off and are 

 attached to the third, fourth, fifth, and sometimes the sixth superomargi- 

 nal plate. 



Color. — In alcohol, the ground color is dull cream buff, lightly over- 

 cast with gray, papular areas slightly darker gray; spines almost white 

 with tinges of cream buff. 



Holotype. — AHF no. 45 ; 7 paratypes. 



Type locality. — Holotype and 6 paratypes from Station 1306-41, 

 228-267 fms., loose rock, submarine bank 6 miles east of Long Point, 

 Santa Catalina Island, California, May 3, 1941. An additional paratype 

 from Station 1425-41, 280 fms., loose rock, 11.5 miles S.E. of Church 

 Rock, Santa Catalina Island, California, September 28, 1941. 



Remarks. — There is some variation in the length and number of 

 spines on the paxillae; some bear secondary spines, some have just spi- 

 nules surrounding the large central spines, and others, mainly on the larg- 

 est specimens, have a central spine surrounded by equally large spines. 

 There are other variations already mentioned. The youngest specimen of 

 R==32 mm., r=5 mm., had no papulae in the center of the disk, the nar- 

 row interradial area, longitudinal center of the proximal part of ray, and 

 distal two thirds of ray. In each area there were about 62 papulae, which 

 extend out in 2 double rows to the fifth and a single row to the ninth su- 

 peromarginal. The armature of the plates and of the paxillae was es- 

 sentially the same as in the larger specimens. No pectinate pedicellariae 

 were observed. 



