BRYOZOA OF THE PHILIPPINE REGION 119 



is rarely bilamellar; more often it is subcylindrical, hollow, encrusting 

 probably some small alga, and multilamellar. The ovicell is hyper- 

 stomial, convex, deeply embedded in the distal zooecium; its orifice 

 can not be closed by the operculum. 



There is never an ectocyst. This appears in the interior of the 

 zooecium and is visible by the frontal pore which appears thus closed 

 by a thin membrane. The operculum is feebly chitinized and is 

 not clearly separated from the compensatrix ; its form resembles a 

 great deal that in the Petraliidae. 



The structure of the frontal is very different from that of the species 

 covered by the ectocyst and we can not conceive that the frontal 

 results from the union of the spines or of the spicules. 



The marginal pores have the aspect of those in the Adeonidae but 

 they are not special to each zooecium and there is only a single 

 range between two adjacent zooecia; they appear to be really parietal 







A B C 



Fig. 27. — Tremogasterina celleporoides Busk, 1884 

 A-D. Different mandibles of zooecial avicularia, X85. E. Operculum, X85. 



dietellae. With age and wear the zooecia assume most fantastic 

 aspects. 



Biology. — Almost all our specimens were dead and nonovicelled 

 but a few living examples have permitted the study of the structure; 

 they were in reproduction (ovicelled) February 21, 1908 (372 meters). 

 Occurrence. — 



D. 5137. Jolo Light, Jolo; 6° 04' 25" N.; 120° 58' 30" E.; 20 



fathoms; S. Sh. 

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



co. S. 

 D. 5144. Jolo Light, Jolo; 6° 05' 50" N.; 121° 02' 15" E.; 19 



fathoms; co. S. 

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



fathoms; co. S., Sh. 

 D. 5147. Sulade Island; 5° 41' 40" N.; 120° 47' 10" E.; 21 



fathoms. 

 D. 5151. Sirun Island, Tawi Tawi Group; 5° 24' 40" N.; 120° 

 27' 15" E.; 24 fathoms; co. S., Sh. 



