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 for- 
wards 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 esophagus is rather narrow above (1':0 in diameter), and 
extends for 2!'"3 beyond the diaphragm. 
The stomach of Hrethizon dorsatus partially cut open, showing 
the two internal folds. 
@, esophagus ; 0.d, bile-duct ; p.d, pancreatic duct; p.v, pylorie 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 (7. e. on 
the stomach’s greater curvature); the other, less marked, on the 
Proc. Zoo. Soc.—1882, No. XVIII. 18 
