OCR Text |
Show 1882.] ANATOMY OF ERETHIZON DORSATUS. 273 the hinder and larger part being crescentic and placed just behind, beneath, and within the angle of the mandible. The duct runs forwards from the more anterior part of the gland. There is a considerable zygomatic gland placed beside the upper molars, its duct opening in the vicinity of the last upper molar. The oesophagus is rather narrow above (l''*0 in diameter), and extends for 2"-3 beyond the diaphragm. Fig. 2. The stomach of Erethizon dorsalns partially cut open, showing the two internal folds. ce, oesophagus ; b.d, bile-duct; p.d, pancreatic duct; p.v, pyloric valve; sp, spleen. The stomach is an elongated pyriform viscus, bent very sharply on itself towards its pyloric end. Its walls are very thin ; and there are no longitudinal internal folds nor any marked transverse folds, except two. One of these is situated about an inch from the pyloric valve, on the convex side of the pyloric flexure (i. e. on the stomach's greater curvature) ; the other, less marked, ou the PROC. ZOOL. Soc-1882, No. XVIII. 18 |