BRYOZOA OF THE PHILIPPINE REGION 175 



Occurrence. — 



D. 5574. Simaluc Island, north of Tawi Tawi; 5° 30' 45" N.; 



120° 07' 57" E.; 340 fathoms. 

 D. 5579. Sibutu Island, Darvel Bay, Borneo; 4° 54' 15" N.; 

 119° 09' 52" E.; 175 fathoms; fine S., Co.; 13° C. 

 Cotypes.— Cat. Nos. 7975, 7976, U.S.N.M. 



STOMHYPSELOSARIA DUPLIFORMA, new species 



Plate 21, figs. 1-3 



Description. — The zoarium is free, quadrangular, bifurcated. The 

 zooecia are distinct, separated by a small thread, smooth, little elon- 

 gated, wide; the mural rim is very thick laterally, granulated, sepa- 

 rated into two portions by a furrow; the cryptocyst is shallow, 

 elliptical, smooth. The aperture is semielliptical, transverse; the 

 proximal border bears two small lateral indentations and sometimes 

 two very small denticles. The ovicell is convex, salient, transverse, 

 opening obliquely above the apertura. 



Measurements. — 



. \1ia = 0.08-0. 10 mm. ~ . [Lz = 0.60-0.70 mm. 



Apertura, Zooecia, _ 



lm = 0.10mm. U2 = 0. 36-0.40 mm. 



Affinities. — This species is very well characterized by its apparent 

 double mural rim. Well-preserved specimens alone are granulated. 

 The ovicell is much smaller than that of Stomhypselosaria condylata. 

 Our specimens were dead and deprived of ectocyst. We are ignorant 

 of their mode of fixation. It is a species of very deep water. 

 Occurrence. — 



D. 5574. Simaluc Island, north of Tawi Tawi; 5° 30' 45" N.; 



120° 07' 57" E.; 340 fathoms. 

 D. 5580. Sibutu Island, Darvel Bay, Borneo; 4° 52' 45" N.; 

 119° 06' 45" E.; 162 fathoms; br. S., Co. 

 Cotypes.— Cat. Nos. 7977, 7978, U.S.N.M. 



Genus MESOSTO MARIA .Canu and Bassler, 1927 



The ovicell is endotoichal; it is convex; its orifice is large and 

 placed obliquely above the apertura. The apertura is removed from 

 the distal border of the mural rim and surrounded by a special peri- 

 stome; it is deprived of denticles. The zooecia are arranged in 

 transverse rows. 



Genotype. — Mesostomaria strictoramae, Canu and Bassler, 1927. 



Range. — Miocene to Recent. 



The known species of this genus are as follows: 



Mesostomaria strictoramae, Canu and Bassler, 1927 Recent. 



Mesostomaria (Melicerita) atlantica Busk, 18S5 Recent. 



Mesostomaria (Cellaria) angustiloba Busk, 1885 Miocene, Recent. 



Mesostomaria (Cellaria) acutimarginata MacGillivray, 1895.. Miocene. 



Mesostomaria (Salicornaria) magnifica Busk, 1885 Recent. 



