574 PROUT—BRYOZOA, 4TH SEIRES. 
summits ; those toward the upper border are not dimpled, and 
are still covered with chalices. Dimples oblong oval; ina 
rangement of the dimples on the summits of the mammille, 
and the existence of mammillary swellings instead of an ir- 
regularly waved surface, will, we believe, sufficiently distin- 
guish them from one another. 
Geological position and Locality—Keokuk Limestone, or 
first Archimedes group, near Warsaw, Illinois. Tllinois State 
Collection, No. 6. 
CoscINIuM ASTERIA, n. sp. 
Polyzoum a thin, irregular encrusting expansion, covered 
with small chalices, except at certain points, which have the 
appearance of oblong, radiating, or substellar markings formed 
of more prominent lines of chalices, with narrow abortive 
spaces between them. These substellar dimples are more or 
- less irregular in form, the rays being sometimes unduly pro- 
longed, but are somewhat regularly arranged in relation to 
one another, being more or less quincuncial in their distribu- 
tion. The distance between the substellar points is in gen- 
eral about 5 mm. 
Geological position and Locality.—Keokuk Limestone, or 
second Archimedes group, near Warsaw, Illinois. Illinois 
State Collection, No. 7. 
Coscrntum ESCHARENSE, N. sp. 
Polyzoum a flat expansion most robably encrusting, cover- 
ed with small shubioay except at rythinieal points, where the 
w dimples seem to have denuded the surface. 
Geological position and Locality —Keokuk Limestone, or 
mao. near Warsaw, Illinois. Illinois State 
ee ee oe 
net-work, developed from a sole marked by tra 
