

MONOGKAPH OF THE EXISTING CBIXOIDS. 



257 



Indeed, they are never so completely circular as are those of Zenomeira. As an 

 additional character it may be mentioned that the eentrodoraal of Psaihyrometra is 

 always proportionately shorter and more regularly conical than that of Zenometra. 



FIG. 262. 



FIG. 203. 



FlQ. 264. 



FIG. 205. 



FIGS. 202-206. 2G2, VENTRAL VIEW OF THE CENTRODORSAL OF A SPECIMEN OF CVLLOMETRA DISCIFORMIS FROM THE Ki ISLANDS 

 (AFTER P. II. CARPENTER). 203, VENTRAL VIEW F TME CENTRODORSAL OF A SPECIMEN OF NEOMETRA MULTICOLOR FROM 

 SOUTHERN JAPAN. 204, VENTRAL VIEW OF THE CENTRODOBSAL OF A SPECIMEN OF TRUHOMETRA CARINATA (AFTER P. H. 

 CARPENTER). 203, VENTRAL VIEW OF THE CEXTRODORSAL OF A SPECIMEN OF TROPIOMETRA INDICA FROM CEYLON. 266, 

 VENTRAL VIEW OF THE CENTRODORSAL OF A SIX-RAYED SPECIMEN OF THOIMUMETP.A PRTA FROM Rio I>E JANEIRO 



In the genera in which the cirrus sockets are arranged in alternating rows, 

 with no division into radial areas, generic and sometimes also specific characters 

 ma}- be found (1) in the general shape, which varies from low hemispherical to 



