38 



PROCEEDINGS OP THE NATIONAL, MUSEUM 



the tubes. The distance of the peristomes is quite variable. In 

 certain portions the peristomes are very close together and in other 

 places they are grouped in transverse rows. 



The ovicell, in its complete form, is a large pyriform quite salient 

 sack, very convex, perfectly symmetrical, and terminated by a very 

 small oeciostome. But it often presents forms less symmetrical in 



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shape. However, it is very rare that on the same specimen of 

 cyclostomatous bryozoan all the ovicells are identical in shape. 

 Irregularity is the rule. 



In longitudinal section the tubes are cylindrical, long, with tri- 

 parietal gemmation on the basal lamella and narrowed at their base 



