BRYOZOA OF THE PHILIPPINE REGION 



289 



1916. Discopora sarsi Levinsen, Danmark-Ekspeditioncn til Gronlands Nordost- 



kyst, vol. 3, p. 462. 

 1918. Discopora sarsi Nordgaard, Bryozoa from the Arctic region, Tromso 



Museums Aarschefter, vol. 40, no. 1, p. 76. 



Measurements. — 



Feristomice 



lip 



-0. 15-0. 17 mm. .(is =0.80 mm. 



Up =0.20 mm. Z-ooeciaj^ ^ 4Q mm 



Variations. — The zooecia of our specimens are a little smaller than 

 those of specimens collected in the northern seas. The zoarium is 

 not pigmented. These small differences would be sufficient possibly 

 for the formation of a new variety japonica. 



This species is very common and has been dredged very frequently, 

 but only Waters, 1900, and Jullien, 1903, have studied it in detail. 

 In the Albatross material there were only 

 seven dead specimens which have not 

 permitted us to make a serious study. 

 Our thin sections were made from speci- 

 mens from Greenland presented to us 

 by Levinsen. 



Biology. — This is a circumpolar species. 

 Nordgaard, 1912, has published a chart 

 of the boreal region showing its geographic 

 distribution. It has not been cited in the 

 West Pacific so that our discovery com- 

 pletes his chart. 



It was in reproduction (ovicelled) Au- 

 gust 2, 1887 (1,267 meters). It can live 

 at a temperature of 0° C. It is particu- 

 larly abundant at depths of 20 to 160 

 meters; but it has, however, been dredged 

 at 249 meters north of Norway and at 

 1,267 meters at Newfoundland. 



Occurrence. — D. 4807. Cape Tsiuka, 

 Sea of Japan; 41° 36' 12" N.; 140° 

 36' E. 



Geographic distribution. — The reader will find the geographic dis- 

 tribution of this species given by the authors listed above, especially 

 on the excellent chart of Nordgaard, 1912. 



Plesiotypes.— Cat. No. 8036, U.S.N.M. 



Genus CIGCLISULA Canu and Bassler, 1927 



The ovicell is hyperstomial, opening in the peris tomie, never closed 

 by the operculum with the frontal perforated by ver3 7 large pores. 

 The frontal is a thick tremocyst with tubules. The apertura is oval; 

 the peristomice bears a wide pseudorimule bordered by a peristomial 

 avicularium. The operculum bears two large lateral bands terminated 



Fig. 



A 



120.— Post end a 

 Smitt, 1867 



A. Longitudinal thin sec- 

 tion, X 16 cutting two ovicelled 

 zooecia. The ovicell is con- 

 cealed and closed by the oper- 

 culum. B. Section through an 

 ordinary zooecium, X 16 show- 

 ing the arrangement of the 

 tubules. 



