274 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



The aperture seen under a good light, is in reality transverse with 

 schizoporidan aspect and a wide rimule; there is therefore a very 

 large semielliptical anter and a small, concave poster. 



The operculum is black; it opens in the peristomie without closing 

 the ovicell. 



Biology. — We have some specimens which were in reproduction 

 February 15, 1908. There are some ovicelled zooecia deprived of 

 spiramen and also some nonovicelled zooecia which lack it; the 

 spiramen is therefore no more necessary to the fuHction of reproduc- 

 tion than to the hydrostatic system. 



Fig. 112. — Genus Cosciniopsis Canu and Bassler, 1927 



A, B. Cosciniopsis vestita Hincks, 1882. A. Ovicelled specimen (after Hincks, 

 1882). B. Operculum, X 85. (After Waters, 1889.) 



C-F. Cosciniopsis vestita var. australis Waters, 1887. C. Zooecia, X25. 

 D. Operculum, X85. (After Waters, 1887, 1889.) 



E, F. Cosciniopsis lonchoea Busk, 1884. Operculum and avicularian mandible, 

 X140 (after Busk, 1884). 



G. Cosciniopsis caelatus, new species. Operculum, X85. 



Occurrence. — 



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



co. S. 

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

 fathoms; co. S. 

 Cotypes.— Cat. Nos. 8024, 8025, U.S.N.M. 



Genus COSCINIOPSIS Canu and Bassler, 1927 



The ovicell is hyperstomial ; it is closed by the operculum and is 

 porous like the frontal. The aperture bears two cardelles placed low. 

 The frontal is a tremocyst. The operculum bears two large lateral 

 bands; the two muscular attachments are removed from the border. 

 Sporadic avicularia appear in the vicinity of the peristome. 



