
6. STRATIGRAPHICAL GEOLOGY. [Book VI. 
the abundance and variety of the reptilian forms. Mesozoic time — 
has been termed the “Age of Reptiles,” for it witnessed the maxi- 
mum development of reptilian types with the rise and growth of 
whole orders of reptiles which have long since been extinct. The 
ee ae SW wee men 

Fig. 370.—LiAss1c LAMELLIBRANCHS, 
a, Gryphea cymbium (Lam.) (4); b, Lima gigantea (Sby.) (3); ¢, Gryphsea incurva 
ates d, Hippopodium ponderosum (Sby.) (4); e, Posidonia Bronnii (Goldf.) 
nat. size). 
first true turtles seem to have made their appearance during this 
period. Numerous fragments of lacertilians have been obtained. — 
Most abundant are the bones of various crocodilian genera, such as 
Teleosaurus, Steneosawrus, and Goniopholis. Teleosawrus, which occurs 
