PLATE nia. 



RlIYXCIIOXELLA DRYOPE (p^^gC 37). 



Figure 1. Dorsal riew. 



" \a. Front " 



" 16. Side " 



" Ic. Ventral " 



Eatonia peculiaris (page 40). 



Figure 2. Dorsal view, 



" 21. Side " 



" 2b. Front " 



" 2c. Ventral " 



Spirifera superba (page 45). 



Figure 3. Dorsal view. 

 3«. Front 

 " 36. Side " 



Spirifera cycloptera (page 48) 



Figure 4. Dorsal view of an imperfect specimen. 



" 4a. Hinge view of the same. 



" 46. Dorsal view of a smaller specimen. 



" 4c. Ventral view of the same. 



Spirifera raricosta (page 47). 



Fisrure 5. Dorsal view. 



u 



Side " 

 Ventral 



Cyrtixa affinis (page 49). 



Figure 6. Dorsal view. 

 " G'j. Side " 

 " G6. Ventral " 



