Vol. XXIV, pp. 87-88 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON. 



A NEW CRINOID GENUS FROM THE INDIAN OCEAN. 



BY AUSTIN II. CLARK. 



While studying the magnificent collection of recent crinoicls 

 at the British Museum, I detected among the undetermined 

 material representatives of several new species, one of the most 

 interesting of which is the form described below. \ urged Pro- 

 fessor F. J. Bell, who is in charge of the echinoderm collections, 

 to describe these new species; but, with bis characteristic gen- 

 erosity, he suggested that, as I bad become so deeply engrossed 

 in the study of the recent crinoids, it would be more fitting that 

 I should do it. lam therefore deeply indebted to Professor Bell 

 for the privilege of being able to make known the following 

 interesting new genus. 



Cyclometra gen. nov. 



Genotype. — Cyclometra flavesc.ens sp. nov. 



Systematic position. — Family Antedonidae, subfamily Heliometrinse. 



Characters. — This new genus is closely related to Heliometra, which it 

 replaces in the East Indian region; it is distinguished by having P2 

 markedly shorter than Pi instead of approximately of the same length or 

 slightly longer, as in Heliometra, and by the outer segments of Pi, which 

 are somewhat elongated instead of very short. 



Cyclometra flavescens sp. nov. 



Description. — Centrodorsal rounded conical. 



I lirri xxvin, 41-4:!. 30 mm. long; first segment short, second nearly as 

 long as broad, the following gradually increasing in length and becoming 

 twice as long as broad on the fourth; the next five are similar; the fol- 

 lowing gradually decrease in length, after about six more becoming about 

 as long as broad and remaining of those proportions until the end of the 

 cirrus. The earlier segments are slightly constricted centrally, with the 



20— Peoc. Biol. -<«'. Wash., Vol. XXIV, 1911. (87) 



