66 
1 Assembly 
Unio. 
1. primigenius. Shell ovate, ventricose; anterior side narrowed, 
sinuous or contracted; posterior side profoundly dilated; dorsal margin 
elevated, rectilinear, subalated, beaks prominent, acute; posterior ex- 
tremity rounded; cardinal teeth compressed, very oblique; lateral teeth 
lamellar, rectilinear. Length IJ inch. 
2. U. orthonotus. Shell oblongo-ovate, slightly furrowed or contract- 
ed obliquely from beak to base; anterior side very short; posterior side 
elongated; dorsal margin rectilinear and declining; umbonial slope an- 
gulated; basal margin straight; cardinal teeth oblique. Length 1 inch. 
These fresh water shells occur in the red sandstone at Medina, be- 
neath the layers of Fucoides Harlani, the Unios and Planorbis not very 
common, but the cyclostoma in great abundance. 
CRUSTACEA. 
Cryph^us, Green. 
C. greenii. Body tail with the margin rather obtusely 
rounded; surface granulated; lobes obtuse or truncated at the extremity, 
end of the middle lobe somewhat expanded; groove on the ribs short 
and terminating abruptly in an angle. 
Observations. When the crust of this trilobite is removed it exhibits 
very narrow prominent articulations, and no sudden depression at the 
termination of the ribs which is so marked a characteristic in the calli- 
tedes. I have named it in honor of Professor Green to whom we are 
indebted for the name and illustration of the genus. Locality. Moravia 
Cayuga county, in shale with Dipleura. 
Calymene. 
C. marginalis. Buckler with a broad margin; eyes large, semi-oval; 
middle lobe entire, convex, smooth, abdomen ........ 
Locality, near Ithaca, in a boulder. This has a much less prominent 
front than the Rowi, a deeper groove between the eye and middle, 
lobe, and the tubercle which nearly joins the lower angle of the eye is 
much smaller. 
T. A. CONRAD, PalcemtologisL 
