BRYOZOA OF THE PHILIPPINE REGION 493 



Conescharellina incisa Hincks, 1S81 ( = C. angulopora) Australia. 



Conescharellina eburnea Maplestonc, 1909 Australia. 



Conescharellina biarmata Maplestone, 1910 ( = C. angulopora) _ _ Tasmania. 



Conescharellina mulliarmata Maplestone 1910 Tasmania. 



Conescharellina magniarmata Maplestone, 1910 ( = C. angulo- 

 pora) Tasmania. 



We have therefore 10 species in the Australian region and 15 in the 

 Philippines. The species most known, Conescharellina philippinensis 

 does not occur in the Philippine Islands. The latter region is very 

 rich in species for besides the described species there is still in the 

 collections of the United States National Museum a number of 

 specimens certainly belonging to very distinct species. 



Genus TROCHOSODON Canu and Bassler, 1927 



The zooecia are not entirely covered and are separated by pores; 

 the base is crenulated by the last formed range of zooecia. Inter- 

 zooecial pores are present. 



Genotype. — Trochosodon linearis Canu and Bassler, 1927. Recent. 



This new genus differs from Conescharellina in the absence of 

 avicularia, in convex instead of perfectly conical zoaria and in the 

 zooecia which present a visible portion. 



We do not yet understand the biology of these small organisms 

 of which we possess only a small number of specimens. These are 

 animals of great depths. 



Bipora ampulla Maplestone 1910, from Tasmania is the only other 

 known species of the genus. 



TROCHOSODON LINEARIS Canu and Bassler, 1927 



Plate 70, figs. 11-13 



1927. Trochosodon linearis Canu and Bassler, Classification Cheilostomatous 

 Bryozoa, Proc. U. S. Nat. Mus., vol. 69, art. 14, p. 11, pi. 1, fig. 12. 



Description. — The zoarium is orbicular, very convex, subconical. 

 The zooecia are arranged in radial, linear series, each series containing 

 only 2 or 3 zooecia; the interzooecial pores are far apart. The 

 aperture is hidden at the bottom of a peristomie and bears a little 

 visible distal sinus; the peristome is oval. The base is convex, 

 finely granulated and ornamented with small, irregularly disseminated 

 pores; it is bordered by 12 salient zooecia. 



Measurements. — Zoarial diameter, 2.5 mm. 



Affinities. — This species differs from Trochosodon quincuncialis in 

 the linear arrangement of the zooecial series and in the regular base 

 without zooecial convexities. Sometimes the aperture is aborted 

 and is replaced by a pore. 



Occurrence. — D. 5586. Sipadan Islands, Sibuko Bay, Borneo; 4° 06' 

 50" N.; 118° 47' 20" E.; 347 fathoms; gy. M.; 6.8° C. 



Holotype— Cat. No. 8295, U.S.N. M. 



