BRYOZOA OF THE CANAL ZONE AND RELATED 



AREAS. 



By Ferdinand Canu 

 Of Versailles, France 



AND 



Bay S. Bassler 



Of Washington, District of Columbia. 



The following pages contain the descriptions of the few bryozoa 

 that have so far been found in the rocks, of the Canal Zone and 

 related areas. These bryozoa consist of two species from the Em- 

 perador limestone of the Canal Zone collected by Messrs. T. Way- 

 land Vaughan and D. F. MacDonald and three species from the 

 Miocene of Costa Rica collected by D. F. MacDonald. The list of 

 species described is as follows : 



Ogivalina mutabilis, new species, Emperador limestone, Panama 

 Canal Zone. 



Holoporella albirostris (Smitt), Emperador limestone, Panama 

 Canal Zone. 



Gupularia umbellata Defrance, Miocene, Costa Rica. 



Gupularia canariensis Busk, Miocene, Costa Rica. 



Stichoporina tuberosa, new species, Miocene, Costa Rica. 



Order CHEILOSTOMATA. 

 Group MEMBRANIPORAE. 



Genus OGIVALINA Canu and Bassler. 



OGIVALINA MUTABILIS, new species. 



Plate 53, fig. 1. 



The zoarium is incrusting. The zocecia are elongated, oval, dis- 

 tinct, separated by a deep furrow; the mural rim is thin, smooth, 

 rounded; there is often a small gymnocyst. The opesium is very 

 large, irregular, more often oval. The ovicell is endozocecial, small, 



8370d—18 117 



