DIGESTIVE SYSTEM OF THE SHEEP 473 
the pillar. The left coronary grooves do not extend to the curvatures. There is 
no dorsal coronary groove on the right side, but the ventral one is very distinct and 
extends to the curvature. The arrangement of the pillars corresponds to these 
external features. The papillse of the rumen are relatively large and somewhat 
tongue-like; the largest are about a fourth of an inch (ca. 6 mm.) in length. The 
dorsal part is papillated, not glabrous, as in the ox. The lateral part of the rumino- 
reticular fold ends half an inch or more (ca. 1.5 em.) behind the cardia. The 
reticulum is relatively larger than in the ox. Its ventral part curves more back- 
ward and less to the right than in the ox. The parietal surface extends forwardas 
Reticulo- 
Poste- — abomasal 
rior groove 
groove of 
rumen 
Fic. 406.—Stromacu oF SHEEP; RicHT VIEw. 
From photograph of specimen hardened in situ. Dotted line indicates position of spleen. 
far as the sixth rib or intercostal space, and is related to the diaphragm and liver. 
The fundus lies on the sternal part of the diaphragm and is in contact behind with 
the abomasum. The cesophageal groove is disposed in general like that of the ox, 
and is about four to five inches (ca. 8 to 10 em.) long. 
There are, however, several marked differences in the arrangement of the groove. Its ven- 
tral part curves backward, so that the reticulo-omasal orifice is directed dorsally and lies in a trans- 
verse plane about an inch (ca. 2-3 cm.) behind one passing through the cardia. These differ- 
ences are correlated with the small size of the omasum and the large size of the reticulum. 
Tubulo-alveolar glands have been found by Thanhofer and others; they occur chiefly in the 
submucous tissue at the angle of junction of the lips and bottom of the groove. 
The folds surrounding the cells of the reticulum are only 2-3 mm. in height, 
