28o SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 2>7 



PAGE 



Cryptosoon proliferum (Hall) 258 



Fig. I. (Natural size.) View, by transmitted light, of a thin trans- 

 verse section, showing the lamellae. U. S. National Museum, 

 Catalogue No. 58541. 



2. (Natural size.) View, by transmitted light, of a thin section, 



showing the lamellae where there was a slight dislocation, 

 caused by irregularity of growth. U. S. National Museum, 

 Catalogue No. 58542. 



3. (Natural size.) View of the weathered surface of limestone, 



showing several specimens. U. S. National Museum, Cat- 

 alogue No. 58543- 

 The specimens represented by figs. 1-3 are from locality (no) 

 Upper Cambrian, shaly calcareous sandstone resting on massive 

 layers of Potsdam sandstone, east side of the town of Whitehall, 

 Washington County, New York. 



