1 
Fig. 21. — Alimentary canal of Glyptonotus. xl|. 
a , vestibule ; b, alar piriform body, upon which vestibule rests ; c, 
midgut ; d, sphincter region between midgut and hindgut ; e, hindgut. 
of connective tissue. The cutting had evidently been done by the incisor 
processes of the mandibles, the length of the blocks corresponded roughly 
to the reach of these processes from the position of abduction to that of 
adduction, and the food had evident^ been “ bolted ” without the occur- 
rence of any further process of comminution in the vestibule. 
So far as its motor function is concerned, the whole foregut is merely a 
propelling mechanism ; in other words, the process of swallowing is incom- 
294 Proceedings of the Royal Society of Edinburgh. [Sess. 
discovered in the midgut of the dissected specimens. When the food had 
consisted of amphipods these were found, according to size, almost intact 
or cut into longitudinal blocks of about J inch length. Similarly meat 
foodfwas found in strings of similar blocks attached to each other by tags 
