BItYOZOA OF THE PHILIPPINE REGION 



515 



thickened are formed by a tremocyst with very small tubes. The 

 apertura is buried at the bottom of the peristomie and bears a proxi- 

 mal tongue. In the peristomie there are very small triangular 

 avicularia. 



Genotype. — Catadysis (Schizoporella) challengeriana Waters, 1888. 

 Recent. 



This genus was suggested by Waters in 1888. 



Genus POECILOPORA MacGillivray, 1886 



The colony is erect, bilaminate, branched. The zooecia are indis- 

 tinct. The apertura (primary mouth) has a distinct sinus. The 

 peristome begins as an elevated point with a small avicularium on 

 the summit, finally becoming a tumid, subcircular ring. Ovicell 

 immersed, closed by a perforated plate. 



Fig. 213. Genus Poecilopora MacGillivray, 1886 



A-F. Poecilopora anomala MacGillivray, 1886. A. Zoarium natural size. B. 

 Portion from the growing edge. C. Portion from the extremity of a branch, 

 one of the zooecia showing the internal or primary mouth (aperture) . D. Another 

 portion showing the growth of the ovicell. E. Operculum. F. Avicularian 

 mandible. (After MacGillivray, 1886.) 



Genotype. — Poecilopora anomala MacGillivray, 1886. Recent 

 (Australia). 



Genus ORTHOPORIDRA Canu and Bassler, 1927 



(Orthopora Waters, 1904, preoccupied) 



The colony is free and branched. The peristomie is long and 

 partially free; the peristome bears a "long process" terminated by 

 an avicularium with triangular mandible. The proximal border of 

 the apertura and of the operculum is straight; the muscular attach- 

 ments are close to the distal edge of the operculum. The ovicell is 

 situated proximally to the oral aperture; it opens into the peristomie 

 below the operculum; 24 tentacles. 



Genotype. — Orthopora compacta Waters, 1904. Recent (Antarctic). 



