172 



ANIMAL PHYSIOLOGY. 



[LESSON 48. 



short legs, and a tail of moderate length. Its head is broad and 

 flat, at the base of which the " permanent gills," from which its 

 Greek name is derived, are seen on either side. 



753. Its internal structure agrees, in general particulars, with the 

 frogs ; the stomach marks a slight advance in relation to the great 

 regularity and distinctness of the mucous cells, and of the deep-seated 



FIG. 275. 



FIG. 276. 





Stomach of Mcnobrauchus. 



ileum of Menobrauchus. 



capillaries (Fig. 275) ; so, too, the ileum (Fig. 276) shows the lon- 

 gitudinal folds, and the capillary arrangement in great perfection. 



754. Another of these Amphibise, the Menopoma (permanent 

 holes), like the former in size and general particulars, but presenting 

 a series of holes at its sides, like a Lamprey, and not yet found in 

 this country (so far as known), but indigenous to Africa, presents a 

 still further advance in the structure of the stomach (Fig. 277), by 

 displaying in each cell two mucous tubes. 



755. It is deeply interesting to trace the gradual development 

 of such an important organ as the stomach, from its condition in a 

 batrachian reptile up to man, and this principle will be followed (as 

 far as expedient) henceforth. 



i.. 



756. Passing the Ophidian reptiles (snakes), and the Saurians 



FIG. 



FIG. 278. 



Stomach of Menopoma. Stomach of the Snapping Turtle. 



(lizards), we come to the Chelonian order (turtles, tortoises) ; here 

 we find that the nutrimental organs (especially the stomach) have 

 gained a great advance. The injected stomach of the Snapping 



