BRYOZOA OF THE PHILIPPINE REGION 495 



apparent, distal sinus. The peristome is incomplete and developed 



only in the proximal portion. The base is denticulated by the 



presence of eight exterior zooecia; it is very finely granulated. 



Measurements. — 



» , (7i.a = 0.10 mm. „ ~ , _ 



Aperture . Zoanum, D = 1 .0 mm. 



Ua = 0.10 mm. 



Affinities. — This species is very close to Trochosodon linearis but 

 differs from it in its very small zoarium, the small number of lateral 

 teeth, and in the nonconvex base. Should we find these two species 

 in the same locality we would probably identify them as unequally 

 developed colonies, but the habitats are too different to justify this 

 hypothesis. 



Occurrence. — D. 5237. Sanco Point, east of Mindanao; 8° 9' G" N.; 

 126° 31' 45" E.; 249 fathoms; gn. M; 8° C. 



Cotypes.— Cat. No. 8298, U.S.N.M. 



TROCHOSODON DECUSSIS, new species 



Plate 71, figs. 7-10 



Description. — The zoarium is in the form of a cross with bifurcated 

 branches. Each branch bears three longitudinal rows of zooecia, 

 some pores, and semilunar slits. The aperture is elliptical, trans- 

 verse, with a very wide rimule. The base is convex, very finely 

 granulose; it bears very scattered pores laterally. 



Measurements. — 



a , ffta = 0.12 mm. ~ . n onn 



Aperture \ rt „ n Zoarium, D = 3.00 mm. 



Ua = 0.16 mm. 



Affinities. — This species is very remarkable because of the form 

 of its rays. It would be difficult to classify it from incomplete speci- 

 mens. The presence of a distal sinus to the aperture and of semi- 

 lunar slits indicate clearly that it belongs to the Conescharellinidae. 



The small pores of the surface are often replaced by small avicularia 

 with pivot. 



Occurrence. — D. 5237. Sanco Point, east of Mindanao; 8° 09' 06" 

 N.J 126° 31' 45" E.; 249 fathoms; gn. m.; 8° C. 



Cotypes.— Cat. No. 8299, U.S.N.M. 



Genus FLABELLOPORA D'Orbigny, 1852 



The zoarium is bilamellar, flabclliform and grows at the periphery. 

 The zooecia are prismatic, hexagonal, with frontal gemmation, ac- 

 cumulated geometrically in linear rows issuing from the initial base; 

 the part visible externally is the ensemble of the parietal faces. The 

 aperture is eccentric, suborbicular, ornamented with a small proximal 

 pore and with a distal sinus directed toward the growing margin of the 

 zoarium. The avicularia are arranged in one or two rows between 

 the rows of apertures. 



