BRYOZOA OF THE PHILIPPINE REGION ♦ 507 



FLABELLOPORA PLANATA, new species 



Plate 75, fig. 5 



Description. — The zoarium is free, flabelliform, 5 mm. in length; 

 the angle of the initial base is much larger than the terminal angle. 

 The external walls of the zooecia are flat and decorated with oblique 

 and divergent rows of apertures and aviculfcria; the avicularia are 

 elliptical with a beak somewhat enlarged and directed toward the 

 ancestrula. The aperture is suborbicular or somewhat oval; the 

 distal rimule is small and somewhat rounded; the peristome is scarcely 

 visible; the proximal pore is constant and adjacent to the peristome. 



,, . . \ha = 0.10 mm. 



Measurements. — Aperture 7 _ in 



* Ua = 0.lO mm. 



Affinities. — In the form of the aperture this species is close to 

 Flabellopora irregularis but differs from it in its flabellate zoarium, 

 in the absence of granules and pores, and in the superficial aperture 

 with very small peristome. 



Occurrence. — D. 5579. Sibutu Island, Darvel Bay, Borneo; 4° 54/ 

 15" N.; 119° 09' 52" E.; 175 fathoms; fine S., Co.; 13.2° C. 



Holotype.—C&t. No. 8317, U.S.N.M. 



FLABELLOPORA TRANSVERSA, new species 



Plate 75, fig. 3 



Description. — The zoarium is free, flabelliform, transverse, meas- 

 uring 5 to 7 mm.; the angle of the initial base is small and the terminal 

 angle does not exist. Each external wall of the zooecia is decorated 

 with 3 areas rather deep and hexagonal; one containing the aperture, 

 the second a transverse elliptical avicularium, with pivot and the 

 beak turned toward the base, the third a triangular avicularium with 

 the beak turned towards the top. The aperture is orbicular, some- 

 what transverse; the distal sinus is wide and shallow; the peristome is 

 thin and salient; the proximal pore is large and surrounded by a 

 peristome adjacent to the peristome of the aperture. All the zoarial 

 surface is finely granular. 



-,, . A , lha = 0.10 mm. 



Measurements. — Aperture , 



Ua = 0.12 mm. 



Variations. — This description is taken from very well preserved 

 specimens but the superficial alterations are rather frequent. The 

 granulations disappear at the least weathering. Sometimes the 

 aperture alone is surrounded by a hexagonal area. The pivots of 

 the elliptical avicularia are very fragile and frequently lacking. 



The longitudinal section show two external walls, one containing 

 the aperture and the other an avicularium. 



The meridian section shows that the zooecia of the terminal portion 

 of the zoarium enlarge more and more as they approach the external 



