Subfamily Zenometrinae A. II. Clark 



Key to the Genera of the Subfamily Zenometrinai 



.i P and 1' absent (Philippine [slands; 140 — 14S Metres) . . . Balanometra 

 a I', and 1' preseni 



irri with all the segments elongated, the distal entirely uithuilt dorsal 

 processes; or (very rarel) a few of the outermost cirrus segments may 

 hut little longer than broad with slight dorsal tubercles 

 cirrus sockets arranged in closely crowded columns in each radial 

 area; hut the groups of columns in each radial area are usually 

 (almost invariably) separated trom the groups of columns in the 

 adjacent radial areas by long-triangular hare patches; the distal 

 cirrus segments are always greatly elongated, never with any tracé 

 of dorsal pro from the Galapagos Islands anti Pa- 



nanM northward to the Aleutian Islands, and south- 

 ward on the A si at ie coast to Yezo Strait and the 

 northern part of the Sca of Japan; the Hawaiian 

 Islands; the Philippine Islands; the lesser Sun da Is- 

 lands: the Bay of Hen gal and the coast of Travancore, 

 and southward to the Antarctic regions; 336 — 2858 



Metres) Psathyrometra 



columns of cirrus sockets somewhat irregular, and evenly spaced all 

 around the centrodorsal without differentiation into radial groups; 

 the distal cirrus segments may be much elongated with 110 tracé 

 dorsal processes, or little, if any, longer than broad, with slight 

 dorsal tubercles (from the western coast of Sc O t land, and 

 I r e 1 a n d , southward t o Madeira, i n c 1 u d i n g the e n t i r e 



Medi terranean basin; 45 — 1292 Metres) Leptometra 



b 'irri with the proximal segments more or less elongated, but the 

 distal segments short, never longer than broad, and bearing prominent 

 dorsal processes 

 c 1 division series and arm bases smooth; 10 — 14 arms (Kei Islands 



and northern Cu ha: 252 380 Metres) Adelometra 



division serie, and arm bases spiny 



d 1 size large; rirri with more than 40 (50 — 60) segments; columns 

 of cirrus sockets very regular, separated interradially by high 

 ridges, or by broad ban- areas 



e' two column, of cirrus sockets in each radial area. the radial 

 areas being separated by high ridges drom St. Lucia. 



British West Indies, northward to Georgia and 

 Pensacola, Florida; 304—792 Metn ■ Zenometra 



