BRYOZOA OF THE PHILIPPINE REGION 



299 



a small poster from a large anter. The ovicell is large, globulose, 

 marginated finely perforated and granulated; it is hyperstomial, 

 closed by an operculum larger than that of the zooecia. The frontal 

 avicularium is placed in the neighborhood of the apertura; it is 

 oblique, very thin, with a very sharp beak. 

 Measurements. — 



Aperture!* = - 15 mm " Zooeciajf z =°- 6 °-°- 65 mm - 



\la -0.17 mm. \lz =0.50-0.60 mm. 



Variations. — The micrometric dimensions are little regular. A 

 little salient thread is often placed at the bottom of the furrow sep- 

 arating the zooecia. The operculum is of the Schizomavella type but 



G H j 



Fia. 127. — Opercula, etc., X85 of Emballotheca 



A. E. biavicularia, new species. B, C. E. imperfecta, new species. Operculum, 

 X85. and X170. D. E. capitifera, new species. Operculum of ovicelled (D) and 

 ordinary zooecium (E). F, G. E. acutirostris, new species. F. Operculum. 

 G. Small rods (diatoms?) found in the cells and occupying probably the compen- 

 satrix. H. E. latisinuata, new species. I, J. E. subsinuata, new species. Oper- 

 culum of unovicelled (I) and ovicelled zooecium (J). 



with a very narrow margin. The structure of the frontal is that of 

 the ordinary tremocyst. 



Affinities. — This species differs from Emballotheca quadrata Mac- 

 Gillivray, 1880, in its marginated ovicell in its very thin and not 

 elliptical avicularium and in its very different operculum from that 

 figured by Levinsen, 1909. 



Biology. — Our specimens from Jolo were living but nonovicelled. 

 The zooecia contained a large number of small rods (diatoms) which 

 were probably introduced in the compensatrix; we have figured some 

 of them. The intestine is too small to contain them. The diatoms 

 found in the digestive organs of the bryozoa are always much smaller. 

 The function of the avicularia is therefore not to chase them away. 

 Occurrence. — 



D. 5141. Jolo Light, Jolo; 6° 09' N.; 120° 58' E.; 29 fathoms; 



co. S. 

 D. 5145. Jolo Light, Jolo; 6° 04' 30" N.; 120° 59' 30" E.; 23 

 fathoms; co. S., Sh. 



