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BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Lunulariidae. 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. Floridina h. Smittipora G. Ogiva H. Ogivalia 
Fig. 56. — Genera of tlie subfamily Onychocellidae Jullien, 1S88. 
A. Onychocella angulosa Reuss, 1847, X 20. Middle Jacksonian, Wilmington, North Carolina. 
B. Rectonycliocella 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 fusiforme Canu and Bassler, 1917, X 20. Middle Jacksonian, Wilmington, 
North Carolina. 
E. Floridina antiqua Smitt, 1S72. Recent. 
F. Smittipora abyssicola Smitt, 1S72. Recent. 
G. Ogiva actaea D’Orbigny, 1852. Cretaceous (Senonian), Fecamp, France. 
H. Ogivalia cypraea D'Orbigny, 1852. Cretaceous of France. 
Subfamily Onychocellidae Jullien, 1881. 
Bibliography ( anatomical ) — 1881, Jullien, note sur une nouvelle division des Bryoboaires 
Cheilostomiens, Bulletin Societe Zoologique cle 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 
onvchocellaria. 
A- Onychocella B. Rectonychocella 
D. Diplopholeos 
