740 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 

 Genus DIAPEROECIA Canu, 1918. 



1918. Diaperoecia CANU, Les ovicelles des bryozoaires cyclostomes, Bulletin de la Societd 

 Geologique, France, ser. 4, vol. 16, p. 329. 



No adventitious tubes; 10 to 12 tentacles. 



Genotype. Diaperoecia, (Entalophora) intricaria Busk, 1875. 

 Range. Cretaceous-Recent. 



Waters in 1914 preserved the term "Diastopora".for this genus as we now 

 understand it. The new ideas necessitate a new nomenclature to avoid all con- 



oep. 



FIG. 240. Genus Diaperoecia Canu, 3918. 



A G. Views of ovicelled zoaria showing the oeciostome. A. Diaperoecia intricaria Busk, 

 1875. B. Diaperoecia pulclierrima Kirkpatrick, 1890. (A, B. After Harmer, 1915.) C-E. Diape- 

 roecia inter juncta MacGillivray, 1885. (After Waters, 1914, 1887, and Harmer, 1915.) F. Dia- 

 peroecia ventricosa Busk, 1S75. G. Diaperoecia capitata Robertson, 1910. 



fusion, but the insufficiency of the present studies oblige us to preserve provision- 

 ally the old nomenclature; it is necessary, therefore, to consider the ancient genera 

 under their best known significance. It is probable that this genus will be dis- 

 membered according to the form of the oeciostome. Thus the Cretaceous forms 

 appear to have a very small, oeciostome scarcely salient; if this observation be 

 confirmed, it will be necessary to create a new genus for them. 



The previously known species belonging to this genus are : 



Entalophora regrularis MacGillivray. Recent. 



Entalophora capitata Robertson, 1910. Recent. 



Entalophora, interjuncta MacGillivray, 1885. Recent. 



