BRYOZOA OF THE PHILIPPINE REGION 



443 



,iuf ajr 



Fit;. 171). — Genus I'tcracclla Levinsejl, 1909 



Plerocella alata W. Thompson, 1S58. A. General aspect, XH» and frontal 

 and basal surface enlarged. (After MacGillivray, 1S79.) B. Bizooecial inter- 

 node. The mother zooeeial fissure like infrascapular chamber is seen proximally 

 at the small avicularium, X 46. C. An internode with ovicell X40. D. Sagittal 

 -eel inn ihrough the gonozooeciuin and the ovicell and the covering kenozooecium, 

 X40. (B-D. After Levinsen, 1909.) E. Operculum, X85. (After Waters, 

 lss7. I. Zooecium showing terminology: avic, avicularium; cp, Beptulae; 

 - . compensatrix; /, membraneous fenestra; inf. avic, infr-avicidarian compart- 

 ment; j, chitinoue joint; s, suture in calcareous wall; sup. avic., supra-avicularian 

 compartment; x, edge of calcareous plate. (After Harmer, 1902.) 



