204 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Lunulariidiie. Our generic tables show that it is absolutely impossible to class these 

 genera with an endozooecial ovicell in different families ; that they constitute a per- 

 fectly homogeneous assemblage; and that the secondary characters of the avicu- 

 larium (adaptation) are the only characters for generic differentiation. 





L. Hondina 



/O\ 

 F. Smittipora 



G. Ogiva 



H - Ogivalia 

 FIG. 56. Genera of the subfamily Onychocellidae Jullien, 1SSS. 



A. Onychocella a'ngulosa Reuss, 1S47, X 20. Middle Jacksonian, Wilmington, North Carolina. 



B. Rectowj.chocclla semiluna, new species, X 20. Middle Jacksonian, Wilmington, North 

 Carolina. 



C. Velumella levigata, new species, X 20. Upper Jacksonian, West Bank of Sepulga River, 

 Escambia County, Alabama. 



D. Diplopholeos fusiformc. Canu and Bassler, 1917, X 20. Middle Jacksonian, Wilmington, 

 North Carolina. 



E. Floridina antigua Smitt, 1872. Recent. 



F. Smittipora abyssicola Smitt, 1872. Recent. 



G. Ogiva actaea D'Orbigny, 1852. Cretaceous (Senonian), Fecamp, France. 

 H. Ogiralia cypraea D'Orbigny, 1852. Cretaceous of France. 



Subfamily ONYCHOCELLIDAE Jullien, 1881. 



Bibliography (anatomical) 1881, JULLIEN, note snr une nouvelle division des Bryoboaires 

 Cheilostomiens, Bulletin Societe Zoologique de France, vol. 5, p. 7. 1890, CANU, Revision des 

 Bryozoaires du Cretace figures par D'Orbigny, Bulletin Societe Geologique France, ser. 3, vol. 

 28, p. 383. 1909. LEVINSEN, Morphological and systematic studies on the Cheilostomatous 

 Bryozoa, p. 153, pi. 22, fig. 3 ; pi. 24, fig, 10. 



The ovicell. is endozooecial. The parietal muscles are attached to the ectocyst. 

 The cryptocyst is calcified. The avicularia are interzooecial and transformed into 

 onychocellaria. 



