BRYOZOA OF THE PHILIPPINE REGION 301 



This is a diverging type in the group of Emballoiheca. It has in 

 common with it only the large opercular dimorphism and the schizo- 

 poridian aspect. 



Biology. — Our specimens were living and were reproducing (ovi- 

 cellcd) on February 14, 1908 (36 meters). 



Occurrence.— D. 5137. Jolo Light, Jolo; 6° 04' 25" N.J 120° 58' 

 30" E.; 20 fathoms; S. Sh. 



Ilolotype.— Cat. No. 8048, U.S.N.M. 



EMBALLOTHECA (?) IMPERFECTA, new species 



Plate 33, figs. 2-4 



Description. — The zoarium encrusts shells and Orbitulites. The 

 zooecia are distinct, separated by a furrow, small, somewhat elon- 

 gated; the frontal is convex, with granular tremocyst and bears the 

 ovicell of the proximal zooecium and on the median axis a transverse 

 avicularium. The apertura is small, transverse, elliptical. The ovicell 

 is large, orbicular, incompletely calcified, with membraneous frontal. 



Measurements. — 



» , fk-0.07mm. 7 ^.fi2 -0.35-0.40 mm. 



Apertura <„ Zooecia „, 



p IZa =0.08-0.10 mm. Us =0.25 mm. 



Structure. — Everything is original in this small species. The 

 structure of the frontal presents a complicated network of inter- 

 twined lines in the midst of which the tremopores are not visible. 

 The structure of the dorsal is that of a minute drafting board. The 

 operculum does not resemble any other known operculum; it is 

 characterized by its double proximal armature. We do not know 

 where to classify this small species properly. 



Biology. — The ovicell is never complete; it is almost reduced to 

 its membraneous frontal. It is never formed with the zooecium 

 itself as occurs most commonly. It is formed on an old distal 

 zooecium after the regeneration of an ordinary polypide into a female 

 polypidc. The passage of the eggs is made under the ectocyst 

 before the complete formation of the ovicell which develops thus 

 with the embryo itself. Very probably the escape of the larvae 

 occurs by the rupture of the ectocyst. This species was in repro- 

 duction (ovicelled) and fixation (ancestrula) February 15 to March 

 25, 1908 (42-67 meters). 



Occurrence. — 



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



23 fathoms; co. S., Sh. 

 D. 5179. Romblon Light, Romblon; 12° 38' 15" N.J 122° 12' 

 30" E.; 37 fathoms; hrd. S.; 24.2° C. 



Holotype. —C&t. No. 8049, U.S.N.M. 



