BRYOZOA OF THE PHILIPPINE REGION 509 



FLABELLOPOKA PISIFORMIS, new species 



Plate G4, fig. 10 



Description. — The zoarium is small (2.5 mm), suborbicular, very 



thick, pisiform; the basal portion is narrower than the terminal portion 



and an entire colony is slightly flabelliform. The external walls of 



the zooecia are decorated with an aperture, some small pores and an 



avicularium with pivot in which the beak is turned toward the 



ancestrula. The aperture is suborbicular or transverse; the distal 



sinus is very wide and shallow; the peristome is very thin and little 



salient; the proximal pore may be confounded with the other small 



pores. 



-,, A iha^OAO mm. 



Measurements. — Aperture^ 



[la =0.12 mm. 



Structure. — The great thickness of the initial base is very charac- 

 teristic; the longitudinal section resembles that of Conescharellina 

 a great deal, but there are no central hydrostatic chambers. This is 

 a very interesting intermediate structure. Unfortunately the small 

 number of specimens discovered does not permit us to make a detailed 

 study. 



Affinities. — In the presence of pores between the aperture this 

 species approaches Flabellopora irregularis but differs from it in 

 its much smaller pores, in the absence of granules and in its remarkable 

 internal structure. It appears limited to great depths as 550 meters, 

 with Flabellopora acutirostris which is also of rather small dimensions. 



Occurrence. — D. 5574. Simaluc Island, north of Tawi Tawi; 5° 30' 

 45" N.; 120° 07' 57" E.; 340 fathoms. 



Eolotype.—C&t. No. 8321, U.S.N.M. 



FLABELLOPORA PUSILLA, new species 



Plate 75, fig. 4 



Description. — The zoarium is very small, discoid (2 mm. in diam- 

 eter); the angle of the initial base is large and there is no terminal 

 angle so that the colony is only slightly flabellate. The external 

 walls of the zooecia are smooth and decorated only with the aperture 

 and with an avicularium with pivot with pointed beak turned towards 

 the base; the avicularian chamber is large, convex, and fusiform. 

 The aperture is suborbicular; the distal sinus is wide and shallow; the 

 peristome is thin and little salient; the proximal pore is surrounded 

 by a salient peristome adjacent to the oral peristome. 



,, . K \ha = 0.09 mm. 



Measurements. — Aperture , 



Ua = 0.09 mm. 



Affinities. — This species differs from Flabellopora pisijormis in 

 the absence of parietal pores. It differs from Flabellopora acutirostris 

 in the absence of a transverse distal avicularium and in its flabellate 



