300 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



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

 E.; 57 fathoms; Sh. 

 Cotypes— Oat. Nos. 8045, 8046, U.S.N.M. 



EMBALLOTHECA BIAVICULARIA, new species 



Plate 32, figs. 6, 7 



Description. — The zoarium encrusts bryozoa (Adeonellopsis) . The 

 zooecia are distinct, separated by a salient thread arranged at the 

 bottom of a furrow, somewhat elongated, hexagonal; the frontal is 

 slightly convex and covered with small infundibuliform tremopores. 

 The apertura is elliptical, transverse; the peristome is thin and 

 scarcely salient. The two small oral avicularia are placed in the 

 vicinity of the median zooecial axis; one is always larger than the 

 other. 



Measurements. — 



Apertura!^ = 0M mm ' Zooecia^ = 0M mm - 



Ua =0.12 mm. Xlz =0.40 mm. 



Structure. — The operculum is clearly elliptical but the poster is 

 nevertheless plainly separated from the anter; its structure is iden- 

 tical with other opercula of the same group. 



This species is very well characterized by its two frontal avicularia. 

 Our specimens were living but nonovicelled. 



Occurrence. — D. 5151. Sirun Island, Tawi Tawi Group; 5° 24' 

 40" N.; 120° 27' 15" E.; 24 fathoms; co. Sh. 



Holotype — Oat. No. 8047, U.S.N.M. 



EMBALLOTHECA (?) CAP1TIFERA. new species 



Plate 32, fig. 5 



Description. — The zoarium encrusts nullipores. The zooecia are 

 distinct, separated by a deep furrow, elongated, rectangular; the 

 frontal is convex and covered with small tubular tremopores. The 

 apertura is elliptical, transverse, with a wide rimule little apparent. 

 The ovicell is enormous, globular, deeply embedded in the distal 

 zooecium, wider than the zooecium; it is of the same nature as the 

 frontal and bears a small circular or elliptical area; it is closed by a 

 large transverse operculum. There are large interzooecial avicularia 

 with pivot and spatulate beak. 



Measurements. — 



Aperturaj^ - 12 mm ' Zooecia !^ = °: 5 A 5 mm - 



(la =0.15 mm. dz =0.40 mm. 



Variations. — The large avicularia are always primoserial but all 

 the primoserial zooecia do not have avicularia. The opercula are 

 black, the tremopores are light colored and the ectocyst is very thin. 



