NORTH AMERICAN EARLY TERTIARY BRYOZOA. 



681 



arium). The zooecia on the upper surface are radially arranged around a central 

 area of crowded apertures." (Gregory, 1909.) 



Genotype. Defranciopora (Defrancia) cochloidea Hagenow, 1851. Maas- 

 trichtian. 



J x17 



Lx|2 



Fin. 222. Forma Heteropora de Blainville, 1830. 



A-G. Heteropora cnjptoiiora Goldfuss, 1S27. A. Zoarium, natural size. B, G. Portion of 

 the surface, X 15 find X 5. (Figs. A-C after Hagenow, 1851.) D. A zoarium, X 2. E. Portion 

 of the surface of the same zoarium, X 13. (Figs. D, E after Gregory, 1909.) 



F, G. Zoarium of Heteropora cryptopora var. tcnera Hagenow, 1851, and surface, X 15. 

 (After Hagenow, 1851.) 



H, I. Heteropora conifera Lamouroux, 1821. H. Transverse section through central zooecia, 

 X 12. I. Longitudinal section through marginal zooecia, X 12, showing diaphragms and meso- 

 pores. (After Gregory, 1896.) 



J, K, L. Heteropora pelliculata Waters, 1879. Longitudinal, tangential, and transverse thin 

 section. 



Genus HETEROPORA Blainville, 1830. 



1830. Heteropora DE BLAINVILLE, Dictionnaire des Sciences naturnlles, vol. 60, p. 381. 

 The tubes are cylindrical and long. Mesopores are present. The zoarium is 

 massive or branched. 



Genotype. Heteropora (Ce.riopora} cryptopora, Goldfuss, 1827. 

 Range. Neocomian-Recent. 



