104 Cincinnati Society of Natural History. 
acanthopores. Acanthopores about twice as numerous as the 
cells, not conspicuous; few specimens show them on the 
surface. A small number of irregular, angular interspaces 
simulating mesopores are seen in tangential sections and also 
on the surface. 
Figures 1 and 2.— Natural size views of two rather large examples, 
neither complete. Figure 3.— Portion of a vertical section, 20. 
Figure 4.— Portion of a tangential section, x 20. Figure 5.— A tan- 
gential section of a single zocecium, showing wall structure and 
structure of acanthopores, X 40. 
This species is so readily distinguished by its small, dwarf- 
ish, flattened growth, tuberculated surface and small aper- 
tures from all bryozoa found associated in the same beds, 
and from other species of the genus hitherto described, that 
detailed comparison seems unnecessary. It belongs to a 
section of the genus Homotrypa, which attains a wide devel- 
opment in the Richmond group. 
2 
