BRYOZOA OF THE PHILIPPINE REGION 



437 



impossible to know if they belong to the same genus or not. Under 

 the circumstances we follow the authors and adopt Gemellipora for 

 the type of structure exemplified by G. glabra and leave G. eburnea 

 under Pasythea. 



Fig. 171. — Genus Pasythea Laraouroux, 1812 



A-H. Pasythea eburnea Smitt, 1873. A. Colony, natural size. B. Zooecia 

 with radical fibers. C. Erect zooecia arranged back to back in pairs. From 

 the outer border of the radical disk proceed four or five very slender and delicate, 

 adnate, stoloniferous jointed tubes. (B, C. After Busk, 1884.) D. Arrange- 

 ment of the segments of the colony. E. Part of the creeping stem showing 

 adnate zooecia. F. Part of branch with erected zooecia. G. Outline of a 

 zooecia] aperture. (D-G, I. After Smitt, 1872.) H. Operculum, X250 and 

 X85. (After Waters, 1899). I. Zooecia with elongated proximal portions. 



Genus DITTOSARIA Busk, 1886 



The zoarium is rigid, calcareous, erect, phytoid, dichotomous. 

 The zooecia are adnate by the back and throwing out a double cell 

 at each dichotomy; the surface is ornamented with a double series of 

 areolae. The aperture is nearly round. No ovicell. 



Genotype. — Dittosaria vjetherelli Busk, 1886. 



Range. — Ypresian, Stampian. 

 2182—29 29 



