BRYOZOA OF THE PHILIPPINE REGION 



497 



but a little attention allows the recognition of this feature. More- 

 over the proximal pore is so shallow that it disappears with the least 

 abrasion and many of the zooecia appear deprived of it. We have not 

 observed ovicells nor have we discovered the arrangement of the 

 zooecia around the anccstrula and we are ignorant of the mode of 

 formation of the two adjacent zoarial lamellae. For this a large num- 

 ber of sections is necessary and our specimens are too few. The 

 ancestrula is always placed at the base of the colony on the median 



Fig. 208.— Structure of Flabellopora D'Orbigny, 1852 



A. Theoretic form of a zooecium of Flabellopora and Conescharellina. B. 

 Section through a zooecium of a Cheilostome; a, aperture; c, compensatrix; d, 

 dorsal; p. d, distal wall;/, frontal. C. Longitudinal section in three superposed 

 zooecia of Flabellopora or Conescharellina. The anatomical arrangements are 

 identical with those of other Cheilostomes, but the apertures open in the distal 

 wall. D. Portion of a meridian section, X45, showing the difference in orienta- 

 tion between the zooecia of the basal region and the others. E. Flabellopora 

 elegans, new species. Longitudinal section, X 16. ap, aperture; au., avicularium. 

 F. F. acuta, new species. Meridian section, X16, showing the geometric 

 arrangement of the cells. G. F. aspera, new species. Longitudinal section, 

 X16. H. F. transversa, new species. Transverse section X10. 



axis and at a slight distance from the inferior border. The first cells 

 formed are exactly the most inferior ones. They serve as supports of 

 the oblique heaps of superposed zooecia. They are arranged in V 

 shape, which gives a great solidity to the entire structure developed 

 upon the ancestrula. We have called this the initial base, the proxi- 

 mal part of the colony; it corresponds absolutely to the basal lamella 

 of other Cheilostomata. It always constitutes the broader portion 

 of the colony; its point is more or less obtuse. 



