BRYOZOA OF THE PHILIPPINE REGION" 433 



COSTAZIA PISIFORMIS, new species 



Plate 63, figs. 6, 7, 10 



Description. — The zoarium forms small spherical masses in which 

 the size does not exceed that of a pea. The zooecia are small some- 

 what extended on the borders of the colony, very erect at the center; 

 the frontal is convex, perforated by tremopores and ornamented with 

 costules; it bears a small tubular avicularium forming an umbo when 

 it is close to the aperture. 



The aperture is buried at the bottom of a peristomie in which the 

 peristomice is ogival; it bears a very wide proximal rimule of little 

 depth. The ovicell is large, globular, or somewhat transverse; the 

 frontal area is large, deep, costulated; the corresponding aperture is 

 a little larger. The oral avicularia, are long, thin, fusiform, placed 

 on the very thin peristome. The zoarial avicularia are elongated, 

 elliptical immersed; their orifice is large and traversed by a pivot. 

 Measurements. — 



* f7wi = 0.12 mm. Zooecia jLz = 0.60 mm. 



\la = 0.10 mm. (recumbent) 1^2 = 0.30 mm. 



Affinities. — The zooecial measurements have no value for determina- 

 tion for they are too variable; most of the erect zooecia measure only 

 0.30-0.35 mm. in diameter. 



This species is very well characterized by its oral fusiform avicularia 

 and by the presence of frontal fusiform avicularia, but it is of a dis- 

 concerting variability. 



The specimens from the China Sea are ornamented with a much 

 larger and a little elongated ovicell and with numerous zoarial avicu- 

 laria; these may be designated as variety sinensis (pi. 63, fig. 10); 

 the oral avicularia are a little shorter. The other characters are 

 identical with those of the specimens from Japan. 



The specimens of Strait of Surigao bear a cribriform area on the 

 ovicell; this form may be another variety. 

 Occurrence. — 



D. 4807. Cape Tsiuka, Sea of Japan; 41° 36' 12" N.; 140° 36' 



E. (common). 

 D. 5311. China Sea, vicinity of Hong Kong; 21° 33' N.; 116° 



15' E.; 88 fathoms; crs. S., Sh. 

 D. 5478. Tacbuc Point, Leyte; 10° 46' 24" N.; 125° 16' 30" E.; 



57 fathoms; Sh. 

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

 1 19° 09' 52" E.; 175 fathoms; fine S., S. Co.; 13° C. 

 Cotypes — Cat. No. 8258, U.S.N.M. 

 Bolotype. — Cat. No. 8259, U.S.N.M. (var. sinensis). 



