BRYOZOA OF THE PHILIPPINE REGION 389 



D. 5162. Tinagta Island; 5° 10' N.; 119° 47' 30" E.; 230 fathoms; 



S. brk., Sh. crs.; 11.6° C. 

 D. 5577. Mount Dromedario, north of TawiTawi; 5° 20' 36" N.J 



119° 58' 51" E.; 240 fathoms; crs. S.; 12.4° C. 

 Coiypes.— Cat. Nos. 8191-8193, U.S.N.M. 



CHEILOPORINA IRREGULARIS, new species 



Plate 54, fig. 1 



Description. — The zoarium is free and unilamellar. The zooecia 

 are distinct, separated by a furrow, very little elongated, irregular; 

 the frontal is convex and covered with very numerous and very small 

 tremopores. The apertura is semielliptical, transverse; two strong 

 salient cardelles placed very low separate a wide poster from a nar- 

 rower and subcircular anter. The ovicell is very small, endozooecial, 

 scarcely convex. 



Measurements . — 



Apertura-f^ - 13 mra - Zooecia^* = 0.50-0.60 mm. 



\la -0.16 mm. \lz -0.40-0.60 mm. 



Affinities. — We have found only two very small fragments of this 

 species. It was interesting to note in one of them an aperture trans- 

 formed into an avicularium with pivot. This species approaches the 

 genotype Cheiloporina circumcincta Neviani more than the two pre- 

 ceding species, which are provided with a thick peristome. 



Occurrence.— D. 5145. Jolo Light, Jolo; 6° 04' 30" N.; 120° 59' 

 30" E.; 23 fathoms; co. S., Sh. 



Holotype.—C&t. No. 8194, U.S.N.M. 



Genus TREMOSCHIZODINA Duvergier, 1922 



TREMOSCHIZODINA CRASSA, new species 



Plate 54, figs. 8-11 



Description. — The zoarium is unilamellar and encrusts small algae 

 or shells; the ectocyst is rose colored. The zooecia are distinct, sep- 

 arated by a deep furrow, elongated, elliptical; the frontal is convex, 

 thick, rugose; it is formed by a tremocyst with large, widened pores 

 surmounting a thin olocyst. The aperture is round or somewhat 

 transverse; the anter is semicircular and two strong cardelles separate 

 it from the poster; the proximal border is triangular. The peristome 

 is wide, little salient and ornamented with hollow tuberosities. The 

 endozooecial ovicell is large convex of the same structure as the 

 frontal. The orifice of the ovicelled zooecia is much larger and trans- 

 verse. An orbicular avicularium with pivot appears sometimes in the 

 vicinity of the apertura. The opercula of the ordinary zooecia are 

 transverse; the proximal sinus is very broad and subtriangular. 

 2182—29 26 



