330 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



from deep waters (439 meters) and the specimens of sublittoral waters 

 (36 meters). 



The color of the ectocyst is that of the substratum although one 

 of our specimens is of an intense beautiful red. 

 Occurrence. — 



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



20 fathoms; S. Sh. 

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



19 fathoms; co. S. 

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



120° 47' 10" E.; 21 fathoms; co. S. Sh. 

 D. 5162. Tinagta Island, Tawi Tawi Group; 5° 10' N.; 119° 47' 



30" E.; 230 fathoms; S. brk., Sh. crs. 

 D. 5217. Anima Sola Island, between Burias and Luzon; 13° 20' 

 N. ; 123° 14' 15" E. ; 105 fathoms; crs. gy. S. ; 17.2° C. 

 D. 5478. Tacbuc Point, Leyte; 10° 46' 24" N.; 125° 16' 30" E.; 



57 fathoms; Sh. 

 D. 5577. Mount Dromedario, Tawi Tawi; 5° 20' 36" N.; 119° 



58' 51" E.; 240 fathoms; crs. S.; 12.4° C. 

 D. 5579. Sibutu Island, Darvel Bay, Borneo; 4° 54' 15" N.; 

 119° 09' 52" E.; 175 fathoms; fine S., Co. 

 Cotypes— Cat. Nos. 8098-8100, U.S.N.M. 



Genus INVERSIULA Jullien, 1888 



INVERSIULA INVERSA Waters, 1887 



Plate 39, fig. 7 



1887. Porina inversa Waters, Bryozoa from New South Wales, etc., Annals 

 and Magazine Natural History, ser. 5, vol. 20, p. 190, pi. 4, fig. 23; 

 pi. 5, fig. 5. 



1889. Microporella inversa Waters, Bryozoa from New South Wales, Annals 



and Magazine Natural History, ser. 6, vol. 4, p. 6, pi. 1, figs. 11-12. 



1890. Microporella ciliata Kirkpatrick, Hydroida and Polyzoa from Torres 



Strait, Scientific Proc. Royal Dublin society (n. s.), vol. 6, p. 612. 



The zoarium encrusts spines of sea urchins, nullipores and shells; 

 it is white or pale rose color. The zooecia measure about 0.50 mm. 

 by 0.40-0.45 mm. There is no ovicell. The geometric decoration 

 of the frontal is remarkable and marvelous. It is necessary therefore 

 to compare the genus Inversiula with the genus Anarthropora and 

 Triporula. 



The operculum is very thick and difficult to prepare. It is covered 

 with various ornaments somewhat more crowded than in Water's 

 figure of 1886 but absolutely identical in its general aspect. More- 

 over our opercula are surrounded by a very thin and narrow mem- 

 brane which enlarges it somewhat. This is a very special opercular 

 organization which has never been observed in any other genus. 



