MONOGEAPH OP THE EXISTING CRIXOIDS. 



257 



Indeed, they are never so comi^letely circular as are those of Zenometra. As an 

 additional character it may be mentioned that the centrodorsal of Fsatliyrometra is 

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



Fig. 262. 



Fig. 203. 



Fig. 2G4. 



FiQ. 205. Fig- ^f*- 



Figs. 262-266.— 262, Ventral view of the centrodorsal of a specmen of Cvllometea disciformis from hie Ki Islands 



(AFTER P. H. CARPENIEK). 203, VENTRAL VIEIV OF THE CENTRODORS.VL OP A SPECIMEN OF NEOMETEA MULTICOLOR FROU 



souihekn Japan. 264, Ventral view of tue centrodorsal of a specimen of Tropiometra carinata (after P. H. 

 Carpenter). 205, Ventral view of the centrodorsal of a specbien of Tropiometra indica from Cevlon. 266, 

 Ventral view of the centrodoesal of a suc-r.iyed specimen of Tropiometra picta from Rio de 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 

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



