NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
507 
Fig. 143. — Genus Schizellozoon Canu and Bassler, 1917. 
A-D. Schizellozoon solandcria Risso, 1826. A. Portion of a colony at the point of bifurca- 
tion showing the frontal structure of the adult zooecia and of the ovicells, X 25 (sp= pseudo spi- 
ramen). B, C. Operculum, X 60; seen normally and in profile. D. Mandible of a frontal avi- 
cularium, X 120. (A-D after Calvet, 1902.) 
E-L. Schizellozoon imperati Busk, 1SS4. E. Zooecia provided with a pseudo-spiramen, X 25. 
F. Frontal avicularium, X 25. G. Ovicell, X 25. H, I. Operculum, X 85. (After Waters, 1S58. ) 
J. Mandible of a small frontal avicularium, X 85. K. Mandible of a large frontal avicularium. 
L. Posterior side of a zoarium, X 25. (E-H, .T-L after Busk, 1884.) 
M. Schizellozoon tessellatum Hincks, 1S7S. Group of opereula and mandibles. (After 
Busk, 1884.) 
N. Schizellozoon elongation Busk, 1884. Opereula and mandible. (After Busk. 1884.) 
