MONOGRAPH OF THE EXISTING CRINOIDS. 



237 



centrodorsal in the Comasteridse and in other comatulids arc of no little importance, 

 for there lie in them the five rays of the basal star, which is in close connection with 

 the dorsal surface of the radial pentagon. As a general ndc these intcrradial ele- 



FlG. 195. 



Fig. 192. 



Fig. 194. 



Fig. 196. 



Fig. WS. 



Fig. 197. 



Figs. 191-198.— 191, Dors.*.l view of the centrodoksal of a specimen of Stenometba dorsata from southern- Japan. 



192, LATEII.U. VIEW OF THE CENTRODORSAL AND RADIALS OF A SPECDIEN OF STENOMETRA DORSATA FROM SOUTHERN J.iPAJf. 



193, DOP.SAL VIEW OF THE CENTRODORSAL OF A .SPECIMEN OF SlVLOMETRA SPIN1FERA FROM CUBA. 191, LATERAL VIEW OF 

 THE CENTRODORSAL, BASAL RAYS AND RADIALS OF A SPECIMEN OF STTLOMETRA .SPINIFERA FROM CUBA. 19.i, DORSAL VIEW 

 OF THE CENTRODORSAL OF A SPECIMEN OF TiLU.ASSOMETRA IIAWAHENSIS FROM THE HaWAILV.N ISLANDS. 196, LATERAL VIEW 

 OF THE CENTRODORSAL OF A SPECIMEN OF TUALASSOMETRA HA W.UIENSIS FROM THE HAWAIIAN ISLANDS. 197, DORSAL VIEW 

 OF THE CENTRODORSAL OF A SPECIMEN OF THALASSOMETRA VILLOSA FROM THE WESTERN ALEUTIAN ISLANDS. 19S, LaTER.IL 

 VIEW OF THE CENTRODORSAL OF A SPECIMEN OF THALASSOMETRA VILLOSA FROM THE WESTERN ALEUTIAN ISLANDS. 



vutious and uiterradial grooves are, like the rays of the basal star, entirely devoid 

 of pigment, which is, however, very abundant in the organic base of the calcareous 

 reticulation composing the rest of the ventral surface of the plate, so that when 



