BRYOZOA OF THE PHILIPPINE REGION 453 



Subgenus Stenostomaria MacGillivray, 1895. The zooecia are 

 wide. The apertura bears a proximal and peristomial sinus. Example : 

 Stenostomaria (Catenicetta) solida Waters, 1881, of the Miocene of 

 Australia. 



Dltaxipora MacGillivray, 1895. Zooecia alternate in two con- 

 tiguous rows facing the same way, distinct but closely united; upper 

 outer angle produced and pointed, bearing a sessile avicularium with 

 long triangular mandible and sharp upturned mucro. Ovicells large, 

 imbedded in the distal zooecia. Example: Ditaxipora (Catenicella) 

 internoda Waters, 1881, of the Miocene of Australia. 



Introduced in Strophipora by Levinsen, 1909. Ditaxipora could 

 be preserved as a true genus of the family. 



Family CATENARIIDAE D'Orbigny, 1850 



(Sauignyellidae Levinsen, 1909) 



The zoaria are richly branched, jointed, chainlike and each seg- 

 ment consists of a single zooecium. The zooecia are narrow, elon- 

 gated, rather slightly calcified; the frontal surface, provided with 

 scattered pores, is separated from the basal surface by a more or 

 less sharp boundary line. The ovicell is recumbent. The distal 

 wall has a number of septulae in its periphery (Levinsen, 1909). 



All the other genera placed in this family by D'Orbigny have been 

 classed in other families. Huxleya is placed here doubtfully. 



Genus CATENARIA D'Orbigny, 1850 



(Savignyella Levinsen, 1909) 



The aperture is surrounded by spines, with a concave poster and 

 with no sinus. An avicularium is situated proximally to the aper- 

 ture. The distal wall has uniporous septulae (Levinsen). The 

 ovarium has two ovarian cells; 15-17 slender tentacles (Waters, 1907). 



Genotype. — Catenaria (Eucratea) lafontii Audouin, 1826. 



Range. — Eocene (Priabonian). Recent. 



The fossil Unicrisia tenerrima Reuss, 1869, belongs to this genus. 



Genus HALYSIS Norman, 1909 



The aperture is round or ovate with a rounded sinus. The distal 

 wall has multiporous septulae. No spines, no avicularium. (Levin- 

 sen, 1909.) The ovarium has many ovarian cells; 20-22 tentacles 

 (Waters, 1907). 



Genotype. — Halysis (Scruparia) diaphana Busk, 1860. Recent. 



According to Waters, 1913, this genus is synonymous with Catenaria. 

 2182—29 30 



