NORTH AMERICAN EARLY TERTIARY BRYOZOA. 503 



FIG. 141. Genus Retcpora Imperato, 1599. 



A, B, C. Retepora celtulosa (Linnaeus) Suiitt, 1867. A. Several zooeeia, X 25. B. Avicu- 

 larium. C. Operculuni and mandible, X S5. (A-C after Waters, 1894, 1900.) 



D. Itctcpora, (SerteUa) graeilis Jullien, 1903. Zooecium, X 115. 



E. Retcpora (Sertella) acqiiitanica Jullien, 1903. Several zooecia, X 70. 



F. Rclcpora (SerteUa) nccanica Jullien, 1903. Portion of a branch, X 70. (D-F after 

 Jullien, 1903.) 



G. Retepora incditcrranea Sinitt, 1867. Oral aperture and operculum, X 85. (After Waters, 

 1894.) 



H. Retepora complanata Waters, 1894. Operculum, X 85, and mandible, X 250 (After 



Waters, 1894.) 



I. Retcpora (Scrtclla) bcaniana King, 1846. Zooecial orifice and reteporidan avicularium, 



X 85. (After Jullieu, 1903, and Waters, 1894.) 



J. Retcpora coucliil Hiucks, 1SSO. Zooecinl orifice and opercula, X So and 250. (After 



Jullien. 1903. and Waters, 1878, 1885.) 



K. Retcpora abyssinica Waters, 1909. Zooecial orifice, operculum, and mandibles, X 85. 



(After Waters. 1909.) 



L. Retcpora jermanensis Waters. 1909. Zooecial orifice, operculum, and mandibles, X 85. 



(After Waters, 1909.) 



M. Retcpora (Sertella) tristis Jullien, 1909. Operculum, X ISO. (After Jnllien, 1903 ) 



N. Retcpora porcellana MacGillivray. 1S6S. Operculum, X 85. (After MacGillivray, 1885.) 



O. Retcpora flssa MacGillivray, 1868. Operculum, X 85. (After MacGillivray, 18S5.) 



P. Retepora grimaldi Jullien, 1903. Zooecial orifice. (After Jullien, 1903.) 



Q. Retcpora producta Busk, 1884. Opercula and mandibles. (After Busk, 1SS4.) 



R. Retepora atlantica Busk, 1SS4. Opercula and mandibles. (After Busk, 1SS4. ) 



S. Retcpora jncksonicnsis Busk, 1884. Opercula and mandibles. (After Busk, 1884.) 



