CLARK: THE CRINOID FAMILY ANTEDONIDAE 511 



gated with overlapping and spinous distal ends {From 

 southern Japan, the Hawaiian and Philippine Islands 

 westward to Cape Comorin, thence southwcshvard to 

 between Marion Island and the Crozets; from the Bay of 

 Biscay northward to 54° 17' N. lat., and from Brazil 

 northward to the Newfoundland banks; 248-2926 meters) 



Trichometra 



The brachials do not have strongly produced and very spinous 



distal -ends; at most the distal edges of the outer 



brachials are bordered with fine spines. 



P x much elongated, between two and three times as long 



as P 2 , composed of 30-40 segments of which a 



few of the basal are short, the following becoming 



slender and greatly elongated (Arctic Ocean from 



icestern Greenland to the Kara Sea, and southward 



to Portugal and Chesapeake Bay, and also in the 



vicinity of Marion Island, southeast of South 



Africa; 18-1800 meters) Hathrometra 



P x the same length as, longer than, or shorter than, P 2 ; 

 but if longer never more than slightly so, and with 

 not more than 20 segments. 

 Cirri with 20-30 relatively short segments of which 

 the last six to thirteen are only very slightly, 

 if at all, longer than broad. 

 Pinnules not especially long; distal pinnules the 

 same length as the proximal pinnules; 

 P 2 resembling P 3 and the following pin- 

 nules, slightly longer and stouter than P 3 

 with somewhat fewer segments which are 

 proportionately longer; P 2 may bear a 

 gonad, though these usually begin on P 3 ; 

 arms 25 mm. to 60 mm. long; cirri L-LX, 

 21-30 (Kei and Meangis Islands, and 

 southern Celebes; 204-1158 meters) 



Nepiometra 

 Pinnules very long; distal pinnules not so long 

 as the proximal pinnules; P 2 very slightly 

 shorter than Pi, but similar to it, with 

 about 18 elongated segments; following 

 pinnules similar; arms about 20 mm. long; 

 cirri about XXX, 20-25 (Southeastern 

 South America; 1080 meters) Phrixometra 

 Cirri with not more than 20 much elongated segments 

 all of which are markedly longer than broad, 

 especially the proximal. 

 More than XXV cirri, which have 10-20 seg- 

 ments (Eastern Pacific, including the Seas 



