NORTH AMERICAN EARLY TERTIARY' BRYOZOA. 
341 
Fig. 101. — Genus Scliizopodrella Ganu and Bassler, 1917. 
A. Scliizopodrella unicornis Johnston, 1847. Zooecia with ovieells and avieularia, X 25. 
t ( After Hincks, 1880.) 
B. Scliizopodrella nivea Busk, 1S84. Zooecia, X 25. (After Waters, 1913.) 
C. Schematic section through the ovicell of Scliizopodrella unicornis Johnston, 1847. (After 
Levinsen, 1909.) ect, ectocyst; oil, olocyst; oo, ovicell operculum; op, operculum; tr, tremocyst ; 
v, vestibulum. 
D. Scliizopodrella nivea Busk, 1884. The two zooecia figured X 50, were near together, but 
not in the same row, and are placed together to save space. A sac-like structure (sc) is shown 
at the base of each ovicell (oc), but of the numerous muscles in this sac only about half of those 
in focus are drawn. It seems that the ovum (ov) passes into this sac, which is then ruptured 
(r), and the ovum is pressed forward into the ovicell, where it segments. The small oral 
glands are shown (ffb). 
E-J. Scliizopodrella unicornis Johnston, 1847. E, F, G. Mandibles, X 85. H, I, J. Oper- 
cula, X 85. (After Waters, 1913, and Nordgaard, 1905.) 
K-O. Scliizopodrella nivea Busk, 1884. K. Basal avicularium, X 150. L. Lateral avicu- 
larium, X 150. M. Mandible, X 85, N. Oral aperture closed by calcareous wall, X 85. 
O. Operculum, X 85. (After Wat.ers, 1913.) 
P-S. Scliizopodrella longirostris Hincks, 1886. P. Avicularium, X 75. Q. Mandible, X 75. 
R. Oral aperture X 75. S. Operculum, X 100. (P-S after Levinsen, 1909.) 
T. Stylopoma spongites Pallas, 1766. Opercula, X 100. (After Levinsen, 1909.) (Intro- 
duced by error.) 
U. Scliizopodrella elmiooodiae Waters, 1900. Operculum, X 85. (After Waters, 1900.) 
V-Z. Scliizopodrella linearis Hassal, 1841. Y, W. Mandibles, X 85. (After Levinsen and 
Waters.) X, Y, Z. Opercula, X 85. (After Waters and Nordgaard.) 
A'. Scliizopodrella errata (Waters, 1875). Operculum, X 85. (After Waters, 1879.) 
