New Lower Silurian Bryozoa. 



181 



branches granistriate and more delicate. P. reticulata, Hall, sp., 

 is a much more delicate species. 



Position and locality: The Tennessee specimens are from lower 

 Trenton limestones (Glade) at Lebanon and La Vergne. The 

 Minnesota ones were collected from the limestones a few feet 

 above the St. Peter's sandstone, near Minneapolis. 



PHYLLOPORINA HALLI, n. Sp. 



Fig. l.—Phyllopprina Halli, n. sp. a, poriferous side of specimen, natural size, show 

 ing the irregular, solid swellings, b, part of same x9. c, reverse side of another exam- 

 ple, natural size; d, portion of same x9. e, tangential section xl8, cutting the zooecia 

 just beneath their mouths ; /. another portion of the same section where it divides 

 the zoarium at a deeper level. 



