734 THE AMERICAN NATURALIST. [VoL. XXXIV. 
EXPLANATION OF PLATE IV. 
Injected folds and villi, cores of villi alone represented, except in Fig. 19. 
14. us near the pylorus. X 70. 
Fic. 15. Villi below the spiral valve. x 70. 
Fic. 16. Villus or part of fold on the spiral valve. x 70. 
Fic. 17. Villus or part of fold below the pylor x 70. 
Fics. 18, 19. Folds from near the pylorus ied highly magnified than the 
above, showing the usual main arterioles with the network of capillaries, and also 
that the network in these cases is continuous. 
