88 



THE MOST PRIMITIVE METAZOA 



(A). Ctenoplana (dorsal view) 



(After Komai.) 



(B). Ctenoplana (side view) 



(After DawydofT.) 



(C). Coeloplana (dorsal view) 



(After Komai.) 



Fig. 30. Aberrant ctenophores. These ctenophores take up a 

 crawling habit and their shape differs from that of Pleurobrachia. 



