258 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 38 



PAGE 



Wanneria walcottana (Wanner) 219 



Fig. I. (Reduced to three-fourths natural size.) Cranidium crushed 

 nearly flat in argillaceous shaly rock. 

 2. (X2.5.) Portion of the surface of the specimen represented 

 by fig. I, enlarged so as to bring out the reticulate structure. 



The specimen represented by figs, i and 2 is from (i2x) Lower 

 Cambrian: i mile (1.6 km.) north of Rohrerstown, Lancaster 

 County, Pennsylvania. It was loaned to me by Dr. H. Justin Roddy. 



