232 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



Body muscle found on lateral side of branchial sac. From 26-35 

 stigmata arranged obliquely from anteroventral to posterodorsal side, 

 15-16 branchial bars or inner longitudinal vessels were counted on 

 zooid with 26 stigmata. Dorsal languets about five. All these 

 features fall in the range of the intraspecific variation in Pyroso7na 

 agassizi, and most probably this is a colony in which the four charac- 

 teristic prominences around the aperture of the colony were missing 

 or torn off during dredging. 



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