NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
291 
The zooecium is closed by an opercular valve. The costules are generally 
closely consolidated together; the lacunae are large and few in number; the lumen 
is more or less distinct. The dietellae are irregular in number (at least three 
lateral pairs). The ovicell is hyperstomial and is always closed by the operculum. 
The orifice often has a mucro. The avicularia are dependent. 
Genotype. — Cribrilina punctata Gray, 1848. 
Range. — Midwayan-Recent. 
Fig. 83. — Genus Cribrilina Gray, 1848. 
A-N. Cribrilina punctata Hassal, 1841. A-D. Various forms of tlie species, X 25. (After 
Hineks, 1880.) E. Ovicell, X 40. The endooecium (olocyst) ( endo ) is visible through the 
broken ectooecium ekto. F. Dietellae are seen on the three marginal zooecia, of which the central 
abnormal one has no aperture, X 55. G. Sagittal section through a zooecium with ovicell. The 
ovicell is inclosed in a kenozooecium (cavity), X 55. The distal end of a zooecium with ovicell, 
from the basal surface. The dietellae of the zooecium and kenozooecium are seeip-X 40. I. Die- 
tellae from the basal surface, X 40. (E-I after Levinsen, 1909.) J. Zooecium seen in profile, 
X 40; f, septula. K. Ovicell and avic-ularian cavity, X 40. I-N. Schematic sections through the 
dietellae, X 35. ( J-N after Levinsen, 1894. ) O. Cribrilina annulata Fabricius, 1780. Three bars 
of the zooecium of a very simple form, X 150. (After Norman, 1903.) 
CRIBRILINA VERRUCOSA, new species. 
Plate 5, figs. 12-14. 
Description . — The zoarium incrusts other bryozoa. The zooecia are distinct, 
separated by a deep furrow, elongated, elliptical, crenulated on their borders. 
The cribriform area is convex and formed of large, radial costules; the lacunae 
are very large, prominent, irregularly placed at the rate of 1 to 2 to each pair 
of adjacent costules. The aperture is semilunar and is at the bottom of a very 
