CLARK ] 



NEW GENERA OF RECENT FREE CRINOIDS 



353 



many specimens from the American shores of the Pacific, and a num- 

 ber from the Bering Sea and Asiatic coasts, only a few are in a con- 

 dition admitting of more than a generic diagnosis. 



The following species are referable to Antedon as here restricted: 



Antedon abyssicola P. H. Carpenter 



" abyssorum P. H. Carpenter 



" adeoncc (Lamarck) 



" adrcstine A. H. Clark 



" alternate P. H. Carpenter 



" angustipinna P. H. Carpenter 



" arctica A. H. Clark 



" bifida (Pennant) 



" briscis A. H. Clark 



carpenteri Bell 



" challengeri A. H. Clark 1 



" ciliata A. H. Clark 



" dentata (Say) 



" diibeni Bohlsche 



" cxigua P. H. Carpenter 



" hirsuta P. H. Carpenter 



" hupferi Hartlaub 



" isis A. H. Clark 



Antcdon japonica Hartlaub 

 " lavis P. H. Carpenter 



longipinna P. H. Carpenter 

 " minuta A. H. Clark 

 " nana Hartlaub 



orientalis A. H. Clark 



parvicirra P. H. Carpenter 

 " parvula Hartlaub 

 " phalangium (J. Muller) 

 " prolixa Sladen 



psyche A. H. Clark 



pnmila Bell 

 " remota P. H. Carpenter 



serrata A. H. Clark 

 " serripinna P. H. Carpenter 



Stella 2 A. H.Clark 



tenclla (Retzius) 



tcnuicirra P. H. Carpenter 



7. PSATHYROMETRA, gen. nov. 



Centro-dorsal long and conical, divided by five interradial ridges 

 into areas containing 3 to 5 parallel vertical rows of cirrus sockets ; 

 cirri with 30 to 40 elongated, compressed, smooth segments, the 

 longest three or four times as long as wide, gradually decreasing in 

 length distally ; terminal spines very small ; disk and ambulacra 

 naked; costals well separated, always rounded; ten arms, strongly 

 convex dorsally, deep, but not carinate nor compressed ; pinnules all 

 much elongated, the first joint as well as the others greatly elongated. 



Color in life light pinkish to deep purple. 



Type of the genus. — Antedon fragilis A. H. Clark, 1907. 



This genus occurs in the north Pacific Ocean, from Panama north- 

 ward, and in the Sea of Japan and the Bering Sea. None of the 

 three species were known to Dr. Carpenter. The species included 

 in this genus are : 



Psathyromctra bigradata (Hartlaub) Psathyrometra erythrizon (A. H. Clark) 

 Psathyrometra fragilis (A. H. Clark) 



1 Antcdon challengeri, new name for Antedon lineata P. H. Carpenter, 

 not Antedon lineatns Pomel, 1887. 



'Antedon Stella, new name for Antedon tenuis A. H. Clark, 1907 

 Antedon tenuis P. H. Carpenter, 1887. 



5 



not 



