PLATE 13 

 Polyorchis penicillata 



Fig. 1. Lateral view of large individual at stage of sexual maturity. 

 X 1.5. 



Fig. 2. Oral view of same. X 2. 



ABBREVIATIONS 



circ. can. — circular canal. 



div. — diverticula of radial canals. 



gon. — gonad. 



in. w. — inner wall of bell. 



man. — manubrium. 



mes. — mesogloea. 



mth. — mouth. 



0. w. — outer wall of bell. 



oc. — ocellus. 



r. — rim of bell. 



r. ca7i. — radial canal. 



tent. — tentacle. 



vel. — velum. 



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