508 CLARK! THE CRINOID FAMILY ANTEDONIDAE 



distal pinnules with very short segments which are 

 rarely longer than broad; cirrus segments very short, 

 only very few, or none at all, longer than broad; Pi 

 and P 2 of approximately the same length (Vicinity of 

 Heard Island, and the winter quarters of the "Dis- 

 covery;" 135-270 meters) Solanometra 



Brachials longer, about as long as broad or slightly longer 

 than broad ; segments of the middle and distal pinnules 

 longer than broad, usually very much so; a number of 

 the earlier cirrus segments longer than broad. 

 Pi with 3CM:5 segments of which those beyond the sev- 

 enth to eleventh are longer than broad, the distal 

 elongate, though never much more than twice as 

 long as broad; P 2 is similar to Pi, but shorter 

 (Arabian Sea to southwestern Japan; 192-2160 



meters) Cyclometra 



Pi with 50-100 segments of which only the terminal are 

 longer than broad, and those only very slightly so; 

 P 2 is similar to Pi, and usually of about the same 

 length. 

 Brachials with smooth distal edges; ossicles of the 

 division series with smooth borders and a 

 smooth dorsal surface; no rudimentary ter- 

 minal comb on the proximal pinnules (Arctic 

 Ocean, and southward to Norway and Nova 

 Scotia; western shores of the Okhotsk and Japa- 

 nese Seas from Cape Terpenia to Korea; 12- 



1340 meters) Heliometra 



Brachials with spinous distal edges; ossicles of the 

 division series with usually spinous borders 

 and commonly with a greater or lesser devel- 

 opment of spines on the dorsal surface; the 

 proximal pinnules bear a rudimentary ter- 

 minal comb suggesting that found in the 

 species of the Comasteridae (From Cape Horn 

 northward along the western coast of South and 

 North America to Alaska, thence westward and 

 southward to southern Japan; 11-1911 meters). 



• Florometra 



The genus Heliometra includes only the well known Heliometra 

 glacialis (Leach) ( = Antedon eschrichti [J. Mtiller] of P. H. Car- 

 penter and earlier authors generally). 



Anthometra, Solanometra, and Florometra are best considered 

 as subgenera of Promachocrinus. A full account of the first two 



