Contributions to the Histology of Brady pus tridactylus. 43 
of a much pleated corium covered with thick epithelium. The 
glandular areas lie external to these ridges, and their cylindrical 
cells have small round nuclei which stain intensely. And, as in 
other glandular parts of the stomach, the muscularis mucosae (a) 
is well developed. 
The muscular part of the pylorus (text-fig. 8) has very thick 
walls. Its stratified epithelium (a) forms a thick rugose layer. 
The submucous tissue ( b ) is well developed, and the muscular coat 
(c) is stronger than in any other part of the stomach. Rapp 
suggested that this part of the stomach exerts an action on the 
hard food similar to that of the gizzard of a bird. 
The muscular coat forms a powerful sphincter, but some 
anatomical works deny that there is such a muscle. 
CL. 
Text-Fig. 10. — Structure of a non-rugose part of the small intestine. 
b, muscularis mucosae ; c, connective tissue ; d-g, muscles. 
The Intestines. 
The duodenum has well-marked Brunner’s glands, and the 
mucosa is thrown into a number of folds, which are more numerous 
at the distal end. 
Peyer’s patches are absent, but the mucous membrane of the 
entire length of the small intestine contains many small clusters 
of lymphoid nodules. 
The ileum and jejunum exhibit alternate rugose and compara- 
tively smooth areas. 
In the rugose parts (text-fig. 9) the glands form a thick covering 
over a moderately thick core (a), in which the connective tissue is 
loose, and the blood-vessels ( b ) are thin walled and capacious. 
Between the glands and core is a well-developed muscularis 
mucosae (c). In some parts there are a few small glands ( d ) out- 
side the muscularis mucosae, and these are similar in position to 
