NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
817 
Fig. 269. — Zoarial forms of Lichenopora. 
A, «-e. Discocavea D’Orbigny, 1853. Genotype. Discocavea irregularis D’Orbigny, 1853. 
Various views of Discocavea elegans Simonowitcb, 1871. (After Simonowitch. ) 
B, a-c. Lichenopora Defrance, 1823. Genotype Lichenopora turbinata Defrance, 1823. 
Lichenopora stellata Goldfuss, 1827. (After Gregory, 1909.) a. Portion of frontal; b. tangential 
thin section, X 20; c, vertical thin section, X 134. 
C, ar-c. Pyncavea D’Orbigny, 1853. Views of the genotype Pyricavea franqana D’Orbigny, 
1853. (After D’Orbigny.) 
D, a-e. Bimulticavea D’Orbigny, 1853. Views of the genotype Bimulticavea variabilis D’Or- 
bigny, 1853. (After D’Orbigny.) 
E, a-d. Semimulticavea D’Orbigny, 1853. Semimulticavea landrioti D’Orbigny, 1853. (After 
D’Orbigny. ) 
F, a-d. Radiopora D’Orbigny, 1849. Zoarium, natural size ancl enlarged, of the genotype 
Radiopora mendonensis D’Orbigny, 1853. (After D’Orbigny.) c, d. longitudinal and transverse 
sections of Radiopora neocomiensis D’Orbigny, 1850. (After Gregory, 1909.) 
G, a-f. Tholopora Gregory. 1909. ( Domopora D’Orbigny. 1849.) G. b, c, d. Zoarium natural 
size, the extremity enlarged and a longitudinal thin section of the genotype Domopora clavata 
Goldfuss, 1827. G, a, e, f. Similar views of Domopora virgulosa Gregory, 1909. (After Simono- 
witch, 1871.) 
55899— 20— Bull. 106 52 
