BRYOZOA OF THE PHILIPPINE REGION 



529 



Family PLAGIOECIIDAE Canu, 1918 



Genus PLAGIOECIA Canu, 1918 



PLAGIOECIA RETICULOIDES, new species 



Plate 78, figs. 1-6 



Description. — The zoarium has the Reticulipora form of growth; 

 the basal lamella is visible only on the terminal branches. The tubes 

 are visible, oblique, separated by a little developed furrow very little 

 convex. The apertures are arranged in trans- 

 verse rows; the peristomes are thin, little salient, 

 adjacent to each other. The ovicell is an ovoid 

 sac in which the large axis is parallel to the 

 zoarial border. 



Measurements. — Diameter of peristomes, 0.10 

 mm.; distance of rows, 0.40.; and width of 

 branches, 1.50. 



Affinities. — This species is characterized by 

 its dorsal which presents two longtiudinal rows 

 of tubes terminated by a very irregular fistular 

 orifice. The Cretaceous Reticuliporas form mag- 

 nificent colonies with polygonal meshes. The 

 Tertiary species are smaller and often incomplete. 

 The present species is absolutely dwarfed in com- 

 parison with the fossil species. This zoarial 

 form is in complete decadence. 



Only the figured examples have been found. 

 They were ovicelled on September 25, 1909. 



Occurrence. — D. 5579. Sibutu Island, Darvel 

 Bay, Borneo; 4° 54' 15" N.; 119° 9' 52" E.; 

 175 fathoms; fine S., Co. 



Cotypes.—C&t. No. 8342, U.S.N.M. 



Fiq. 220. — Plagioecia 

 reticuloides, new 

 species. Longitu- 

 dinal thin section, 

 X25 



Family MECYNOECIIDAE Canu, 1918 



Genus MECYNOECIA Canu, 1918 



MECYNOECIA OBESA Canu and Bassler, 1922 



Plate 79, figs. 1, 2 



1922. Mecynoecia obesa Canu and Bassler, Studies on the Cyclostomatous 

 Bryozoa, Proceedings of the National Museum, vol. 61, p. 12, pi. 1, 

 pL 1, fig. G-8. 



Measurements. — Diameter of peristome, 0.10-0.12 mm.; diameter 

 of tubes, 0.14; distance between orifices, 0.58-1.00; separation of 

 peristomes, 0.66; dimensions of ovicell, 1.30 by 0.70; oeciostome, 

 0.00 mm. (length), 0.12-0.14 mm. (width); and width of branches, 

 0.80. 



