114 Proceedings of the Rojjul Society of Victoria. 



with a diet of earth worms and insects, wliich they devour 

 greedily, while such things as potatoes and bulbs remain 

 untouched. Local conditions however, might affect their 

 preference. 



The Alimentapy Canal. 



The alimentary canal is richly supplied by trachepe, which 

 wrap themselves round the various organs and convolutions, and 

 ramify among the muscles. They form the principal support of 

 the digestive organs in the body cavity (ha?moc(ele). 



I shall enumerate the {nibryonic divisions of the canal and 

 then describe its structuie — 



Classification of Embuyonic Divisions and Pakts. 



It comprises three main divisions : — 



1. The Fore-intestine., which is of ectodermic origin and 



corresponds to the stomodajum of the embryo, 

 includes the mouth, salivary glands, pharynx, 

 fore-gullet, crop (ingluvies) hind-gullet and pro- 

 vent riculus (gizzard). On account of dissimilar 

 structure I have considered it necessary to divide 

 the oesophagus into fore- and hind-gullet ; the 

 fore-gullet embraces the pai't between the pharynx 

 and its opening into the crop, and the hind-gullet 

 the part from the outlet of the crop to the entrance 

 of the proventriculus. 



2. The Mid-intestine., formed from the mesenteron, is 



remarkably short in Gryllotalpa compared with 

 other of the Orthoptera, and comprises only the 

 csecal organs. In this I follow Cuenot (2) who 

 differs from other writers, notably Bordas (1) of 

 later date, who have placed the division a little 

 anterior to the entrance of the duct of the Mal- 

 pighian tubes. I shall state my reasons for so 

 doing later. 



3. The Hind-intestine (part of which is called mid-intestine 



by other writers than Cuenot) corresponds to the 

 proctodpeum. I divide this into (a) fore, {b) mid, 

 {c) hind terminal canal, {d) rectum and {e) anus. 



