496 Intestinal Folds and Villi in Vertebrates 



PLATE III. 



Section and surface view drawings from folds and villi of mammals 

 and birds. 



Fig. 41. Section across a spiral fold of rabbit's cgecum. at time of 

 birth. V = villi, X 50 diameters. 



Fig. 43. Section across a developing valvulee conniventes from a 

 child at term. V=villi, X 50 diameters. 



Fig. 43. Villus near pylorus of a domestic duck. X 38 diameters. 



Fig. 44. (a) Arrangement of villi 110 cm. from the pylorus of a do- 

 mestic duck, (b) Villus 110 cm. from the pylorus of a domestic duck. 

 X 38 diameters. 



Fig. 45. Villus from the caecum of a domestic duck. X 38 diame- 

 ters. 



Fig. 46. (a) The arrangement of villi from the large intestine of a 

 domestic duck, (b) Villus from the large intestine of a domestic duck. 

 X 38 diameters. 



Fig. 47. Section of the intestine of an eight-day chick, taken near 

 the pylorus. X 88 diameters. 



Fig. 48. Section from the intestine of an eight-day chick some dis- 

 tance from the pyloric valve. X 88 diameters. 



Fig. 49. (a) Longitudinal section of a single fold from near the py- 

 lorus of a nine-day chick's small intestine. X 88 diameters, (b) Trans- 

 section from the intestine of the same chick a short distance from the 

 pyloric valve. X 88 diameters. 



