112 FISHER 



California in 1904. Most of these forms are found also in the 

 National Museum material, collected at an earlier date. 



The new forms described below will be figured in the final 

 report. 



Family ASTROPECTINID^) Gray. 



Genus Leptychaster l Smith. 



Lepty chaster Smith, Ann. and Mag. Nat. Hist., Ser. 4, xvii, 



1876, no. 

 Leptopty chaster Smith, Philos. Trans., Zool. Kerguelen Island, 



clxviii, 1879, 2 7^- 



LEPTYCHASTER PACIFICUS Fisher, new species. 



Ravs 5. R = 43 mm. ; r = 14 mm. ; R= $r. Breadth of 

 ray at base 16 mm. 



General form similar to that of L. arctfeus (Sars) but disk 

 rather broader. General form flattened ; rays evenly tapered, 

 bluntly pointed ; interbrachial angle slightly rounded, but 

 abrupt ; abactinal surface subplane ; margin of rays defined by 

 inferomarginal plates, rounded ; superomarginal plates well- 

 developed, relatively larger than in L. arcticus, forming a 

 fairly conspicuous margin to abactinal paxillar area ; actinal 

 surface slightly convex ; actinal interradial areas slightly 

 smaller, and intermediate plates fewer than in L. arcticus. 

 Tube-feet pointed, the proximal with a rudimentary subcorneal 

 disk; superambulacral plates small. 



Abactinal paxillar area fairly compact, the paxillee decreas- 

 ing in size toward center of disk, midradial line, and end of 

 ray ; smallest paxillar in center of disk, the largest on margin 

 of area at base of ray. Paxillas similar in character to those of 

 L. arcticus, but slightly larger, and spinelets a trifle longer. 

 Base of pedicel flaring into a roundish plate with 4 or 5 short 

 rather irregular lobes by which the plates touch or imbricate 

 slightly, and between which the papulse emerge. Larger 

 paxillar with about 25 peripheral and 30 central slender delicate 



1 This is the original spelling, and, as it is very evident that there is no typo- 

 graphical error, this name should be employed instead of Leftoftychaster. 



