NORTH AMERICAN EARLY TERTIARY BRYOZOA. 

 Genus STYLOPOMA Levinsen, 1909. 



359 



1909. Stylopoma LEVINSEN, Morphological and Systematic Studies on the Cheilostomatous 

 Bryozim. pi. 18. (Name only.) 



The ovicell is hyperstomial. It covers the apertura and the avicularia en- 

 tirely. The frontal is a tremocyst. The apertura is provided with a small linear 

 rimule. 



Genotype. Stylopoma (Eschara) spongites Pallas, 1766. 



Range. Miocene Recent. 



Levinsen proposed this name for Eschara spongites and Schizoporella longi- 

 rostris Hincks, 1886; but having recognized that the size of the rimule is not a 

 generic character, he suppressed it. We reestablish the genus, basing it upon the 

 function of the passage of the eggs, which operates in a very different manner from 



FIG. 108. Genus Dakaria Jullien, 1904. 



Dx20 



A-C. Dakaria condylata Nordgaard, 1906. A. Sketch of zooecia, X 26. B. Sketch showing 

 dietellae, X 26. C. Operculum, X 85. (After Nordgaard, 1906.) 



D. Dakaria chevreuxi Jullien, 1904. Young zooecia, X 20. (After Jullien, 1904.) 



E. Dakaria magniporata Nordgaard, 1906. Operculum, X 85. (After Nordgaard, 1906.) 



F. G. Dakaria gelida Waters, 1904. F. Operculum, X 85. G. Interior of zooecium showing 

 the oral condyles, X 25. (After Waters, 1904.) 



that in Schizopodrella, where the species would otherwise have been placed. The 

 great development of the ovicell above the apertura assures this function. 



Genus DAKARIA Jullien, 1903. 



1903. Dakaria JULLIEN, Resultants des Campagnes scientifiqups du Prince de Monaco, fasc. 

 23, Bryozoaires provenant des Campagnes de rHirondeUe (1886-88), p. 90 



The ovicell is hyperstomial and closed by the operculum. The frontal is a 

 tremocyst. The operculum bears a wide rimule and articulates often on two con- 

 dyles; its muscular attachments are elongated on the border. No avicularia. 



Genotype. Dakaria chevreuxi Jullien, 1903. 



Range. Lutetian-Recent. 



The recent species of this genus are : 



Dakaria chevreuxi Jullien, 1903. 



