BRYOZOA OF THE PHILIPPINE REGION 269 



from the ordinary tremocyst. As in all species with long peristomie 

 the operculum is very thin. It is a simple semicircular valve scarcely 

 chitinized, not separated from the ectocyst which is itself thin and 

 fragile. The preparation of such opercula is very difficult and we 

 are never certain of results. 



The micrometric variations are considerable for the species thrives 

 on irregular substrata; we have observed small fragments on which 

 the zooecia have no more than 0.60 mm. in width. The ancestrula is 

 a small zooecium without peristomie. 



Affinities. — As the small crests of the tremopores are more often 

 lacking on dead specimens, the latter have somewhat the aspect of 

 Exechonella. But as the tremopores are smaller and more nu- 

 merous and as the peristomie is tubular, it is rather easy to avoid error 



C 



Fig. 109. — Coleopora erinacea, new species 



A. Foraminifera and other bodies found in the cells, X85. B. Incomplete 

 operculum, X 85, undoubtedly deformed. C. Probable restoration of operculum. 



in determination. This species differs from Coleopora verrucosa in its 

 much larger tremopores which are always adorned with a crest in 

 living specimens. 



Biology. — Almost all our specimens were living, but we have not 

 found the ovicell. The interior of the zooecia contains most diverse 

 and often very large organisms; spicules, rectilinear or curved, large 

 or small foraminifera, diatoms, spines, etc. The variable pigmenta- 

 tion of the ectocyst is rather difficult to explain and it is necessary to 

 examine that of the internal organs of specimens in alcohol or recently 

 dredged. 



This is a species of waters of little depth (20-24 fathoms). The 

 single specimen from D. 5478 (57 fathoms) was dead and unilamellar, 

 that is to say, detached from its substratum. 

 Occurrence. — 



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



fathoms; S. Sh. 

 D. 5145. Jolo Light, Jolo; 0° 04' 30" N.; 120° 59' 30" E.; 23 



fathoms; CO. S., Sh. 

 D. 5147. Sulfide Island, Sulu Archipelago; 5° 41' 40" N.; 120° 



47' 10" E.; 21 fathoms; CO. S., Sh. 

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

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



