220 



BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



In certain fossil comatulids, however, the centrodorsal is very long, and the 

 question arose whether in such cases it might not be composed of several columnals 

 fused instead of only a single one as it had been proved to be in Antedon. P. H. 

 Carpenter was at first inclined to believe that this might be true; but when he had 



FIG. 146. 



FM. 1-17 



FIG. 148. 



FIG. 150. 



FIG. 149. 



FIGS. 146-150. 146, DORSAL VIEW OF THE CENTRODORSAL OF A SPECIMEN OF COMATELLA MACULATA FROM TORRES STRAITS 

 (AFTER r. H. CARPENTER). 147, DORSAL VIEW OF THE CENTRODORSAL op A SPECIMEN OF NEMASTER LINEATA FROM BRAZIL 

 (AFTER P. H. CARPENTER). 143, DORSAL VIEW OF THE CENTRODORSAL OF A SPECIMEN OF COMATULA SOLARIS FROM AUSTRALIA 

 (AFTER P. H. CARPENTER). 149, DORSAL VIEW OF THE CENTRODORSAL or A SPECIMEN OF COMATULA SOLARIS FROM AUSTRALIA 

 (AFTER P. H. CARPENTER). 150, DORSAL VIEW OF THE CENTRODORSAL OF A SPECIMEN OF COMATDLA PECTINATA (AFTER 

 P. H. CARPENTER). 



occasion to describe the recent Zenomctra columnaris (figs. 215, 216, p. 241, and 

 55S, pi. 5), in which the centrodorsal reaches an extreme length, he was unable to 

 find any evidence whatever which would warrant an opinion that more than one 

 columnal was involved hi its composition. 



