﻿Explanation of Plate XXXIV 



(Photographs retouched by Miss Frances Wieser and Dr. E. O. Ulrich.) 



Figs, i, 2. Callocystites jezvettii Hall p. 243 



Fig. 1. The antanal side, showing many brachioles. 

 ' Fig. 2. The anal side of same specimen, showing the anal pyramid. 

 Rochester shales, Grimsby, Ontario. Collection of Dr. B. 

 E. Walker, Toronto. 



Fig. 3. Callocystites canadensis ( Billings) p. 245 



The side, with the anal pyramid to the right. X 2. 



Rochester shales, Grimsby, Ontario. Collection of Dr. B. 

 E. Walker. 



Figs. 4, 5. ApiocysHtes elegans Hall p. 212 



Fig. 4. The anal side. X 2. 



Fig. 5. Same specimen, from the antanal side. X 2. 



Rochester shales, Grimsby, Ontario. Collection of Dr. B. 

 E. Walker. 



Figs. 6-8. Tetracystis fencstratus (Troost ms.) p. 219 



Fig. 6. View showing the upper left-hand pectinirhomb. with the anus 



to the right. X 2. Holotype, 35,091. 

 Fig. 7.. Same, from the anal side. X 2. 

 Fig. 8. Same, from the antanal side.* X 2. 



Brownsport limestone, Decatur county, Tennessee. 



Figs. 9, 10. Tetracystis chrysalis n. sp p. 218 



(See also Plate XL, figures 1-3.) 

 Fig. 9. View showing upper left-hand pectinirhomb. X 2. 

 Fig. 10. Same specimen from the antanal side. X 2. Holotype, 35.063. 

 Manlius formation, near Keyser, West Virginia. 



