379 



Tripartite — divided into three parts. 

 Turbinate — to})-sliaped. 



Umbilicus — the external opening of the hc^How axis of a 



loose coiled shell. 

 Umbo — the area about and inclndint;- the beak in Pelecypods 



and Brachiopods. 



Varix — a row of spines, a ridge or other mark, denoting the 

 former position of the lip on the shell of a gastropod 

 (PL varices ). 



Ventral — pertaining to the lower side, or venter. 



Ventricose — strongly swollen, or bnlging. 



Vesicular — bearing vesicles, or hollow cavities. 



Vestibular area — the area surrounding the cell apertures of 

 some Bryozoa: often depressed. 



Wliorl — a single volution of a coiled shell. 

 Wing — the posterior larger expansion along the hinge line 

 of a Pelecjqjod. 



Zoarium — the aggregates of the polypites ol a Bryozoan 



colony. 

 Zooecium — the Bryozoan cell. 

 Zobid — one of the "persons" or individuals of a zoarium. 



