138 The Cardiac Glands of Mammals 
by a constriction. The stratified epithelium is not however confined to 
the cardiac sac but extends in the form of two wing-like processes pre- 
ceded by the “Grenzfalte” into the pyloric sac. In Arvicola amphi- 
bius, according to Toepfer, the stratified epithelium has encroached 
Fic. 11. Stomachs of: A, Lepus; B, Mus; C, Cricetus, after Toepfer; D, Fiber. 
upon the lesser curvature and replaced a considerable portion of its 
glands. 
In Fiber (Fig. 11, D) and in a number of species of Arvicola this 
specialization has reached its highest degree, the stratified epithelium 
extending over into the pyloric sac along the greater curvature, and 
replacing to.a large extent the pyloric glands and the glands of the lesser 
curvature in such a way that the fundus glands form an islet completely 
