12 Emil Goetsch. 
sidered to be specialized in some degree to meet the mechanical 
conditions imposed by the food. 
The cesophagi of the following rodents were examined: Arctomys 
monax, Sciurus hudsonicus, Tamias striatus, Cavia, Erethizon dor- 
satus, Mus decumanus, Geomys bursarius, Lepus cuniculus, Lepus 
nuttalli mallurus. In the ease of the porcupine (Erethizon) (Fig. 
5 A) only the lower portion of the esophagus about three centimeters 
Yj — Stratum corneum 
if ( 
Z i, 
-—— Stratum granulosum 
“eum Lamina propria 
S. mucose 
“ 
Fie. 5. A 
Transverse section of tunica mucosa of cesophagus of Erethizon. 
in length was available. In addition to the above genera the follow- 
ing rodents have been described by other authors: Mus musculus, 
Arvicola amphibius and Arvicola arvalis, Hypudeeus arvalis, Sperm- 
ophilus citillus. 
With regard to the occurrence of glands, the results of all observa- 
tions hitherto reported are negative except in the case of the rabbit, 
where glands are reported by Graff (80) and by Vogt and Yung 
(94), denied by Klein (71). 
