PROUT—BRYOZOA, 4TH SERIES. 579 
Geological position and Locality.—Blue or Trenton Lime- | 
stone, a Ohio. We are indebted to the kind libe- 
rality of Mr. U. P. James of Cincinnati for this beautiful 
spec ou It must have belonged to a specimen from at least 
4 to 6 inches in length and width, as the concentric oy 
upon it are so end curved as to show a great relative dis- 
tance from the centre 
SEMICOSCINIUM ERIENSE, nN. sp. 
Polyzoum a leaf-like expansion covering one entire face of 
amass of sub-crystaline limestone, three inches long by two 
inches broad, with the sole weathered below the anastomo- 
sing lines of ‘cells, and exposing only a back view of the me- 
dallion face. The quincuncially arranged oscules seem to have 
a parallel penniform distribution with the points of the barbs 
escing, but without distinct rachides or shafts. This ar- 
th nestrules not so large as in S. rhomboideum, 
oval, somewhat: irre in size, with pore-like chalices fill- 
ing their depressions and i arly planted upon their in- 
riper net-work. Wace the schallion fx distribution of 
alli 
of it 
This beautiful but fepeda specimen was presen nted to us 
by Mr. U. P. P. James of Cincinnati, Phin an | is s from ‘Cun- 
ningham Islan | Lake Erie. © Devonian : 
SEMICOSCINIUM TUBERCULATUM, 1. sp. 
aoe broad encrusting expansion, marked with 1 low 
ranges of tubercles, aapered quinouncially, about | twa lines 
apart when measured in rectangles, about three in diagonals. 
F. enestrules rena sometimes uadran lar in form, much 
smaller than in th = = 
lar in their Seisibas on, as as if disturbed by the elevation of the 
which , he 
