BRYOZOA OF THE PHILIPPINE REGION 



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peristomie or on the peristome. The ovicell is hyperstomial and 

 visible only on the young zooecia. The colonies are free and branched. 

 Levinsen established this family principally on the nature of the 

 calcification and classed here Sclerodomus and Tessaradoma Norman, 

 18( 8 the latter of which we introduced in the family Galcopsidae. 



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Fig. 187. — Genus Hah/sis Norman, 1909 



A— H. Ildlysix tliaphan'a Busk, 1860. A. Colony, natural size. B. Zoarial 

 fragment showing the anterior face of t he zooecia and the mode of branching. 

 Then- are no spines and the aperture hears a rounded sinus. (After Busk, 

 1884.) C. Group of three zooecia of which one is ovicelled, X25. D. Lateral 

 view of a zooecium, X25. E. Operculum, X85. F. Section showing embryos 

 </i in the ovicell, also an ovum (ov) in the zooecium, and ovaria (oa) below 

 the ovicell, X25. G. Ovarium, X250, with many ovarian cells. H. Section 

 of zooecium showing endozooccial ovicell (ov) diaphragm (d) and compensation 

 sac (cs), X85. (C-H. After Waters, 1913.) 



The Sclerodomidae seems to us rather close to the Stomachetosel- 

 lidae, Canu and Bassler, 1920. It is to be noted that Jullien, 190:1, 

 has already indicated a family, Tessaradomidae. The larvae of the 

 different genera of these families are still unknown, so that a natural 

 classification is still impossible. 



