44 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



and more slender than in that form, 30 mm. long, with 29-31 seg- 

 ments which are proportionately longer ; there are twenty arms ; the 

 carination of the division series is broader than in woodmasoni; the 

 lower brachials have a broad median keel quite different from the 

 faintly indicated crest of woodmasoni; the outer brachials are very 

 strongly overlapping and broadly carinate, the raised portion, when 

 viewed dorsally, having a triangular shape, the apex of the triangle 

 being proximal ; the same type of carination is found in woodmasoni, 

 but the triangles are narrower. 



COSMIOMETRA WOODMASONI (Bell) 



Antedon wood-masoni 1893. Bell, Journ. Linn. Soc. (Zool.), vol. 24, p. 340 



(1). 

 i. Sahul Bank.— One specimen; the arms are no mm. long; in 

 general this species resembles C. crassicirra from the Hawaiian 

 Islands; the division series are strongly, but roundedly, carinate; 

 there are 40-41 cirrus segments, of which the seventh is a transition 

 segment ; the cirri are comparatively short and stout, 27 mm. in 

 length. 



Genus STENOMETRA A. H. Clark 



STENOMETRA QUINQUECOSTATA (P. H. Carpenter) 



Antedon quinquecostata 1888. P. H. Carpenter, " Challenger " Report, Co- 

 matulse, p. 215 (1). 



i. "Challenger" Station No. 192. — Three specimens, two large 

 and one small ; the cirri are proportionately larger and stouter than 

 those of the Japanese S. dorsata; the arms are 100 mm. long ; the 

 sides of the division series are denticulate ; the lateral portions of the 

 proximal borders of the ossicles of the division series are also more 

 or less denticulate ; the crest of the carination is sharp, and nearly or 

 quite straight ; there is no pronounced denticulation. 



Genus STIREMETRA A. H. Clark 



STIREMETRA SPINICIRRA (P. H. Carpenter) 



Antedon spinicirra 1888. P. H. Carpenter, "Challenger" Report, Comatu- 

 lae, p. 112 (1). 



I. "Challenger" Station No. 164. — Three specimens; this is a 

 curious small and delicate little species with curiously long cirrus 

 spines. 



