Alimentary Si/fiteiu of Gryllotalpa austndis. 129 



through. 1. Marks the junction of stomodseum 

 with mesenteron. 2. Marks the junction of proc- 

 todseum with mesenteron. 



Fig. 4. — Part of a transverse section of the proventriculus, at 

 position marked 3 in Fig. 3, showing a transverse 

 section of one of six similar longitudinal colun)ns. 

 The section has been cut between two radial 

 ridges, and shows the anterior or upper surface 

 of one-sixth part of a ridge; each part is similar; 

 X 90. P. junction of one part with the next 

 corresponding part of a radial ridge ; L.T. lateral 

 tooth ; M.T. median tooth ; M.T.A. median tooth 

 extension. 



Fig. 5. — Summit of left hand lateral tooth and also of median 

 tooth extension, viewed from the side and some- 

 what underneath x 320. 



Fig. 6. — Transverse section of proventriculus at position marked 

 4 Fig. 3 X 90; F.P.C. a food-pulp channel cut 

 across ; T. trachese ; P. similar part to P. in Fig. 4. 



Fig. 7. — Section of wall of caeca, Rabl's fix. Safranin x 310; 

 C.N. a cell-nest ; C.T.B. connective tissue bed ; 

 M.F. outer muscle fibre ; S.C. epithelial cells with 

 filamentous border. 



Fig. 8. — Section of wall of cseca at position marked 1 in Fig. 

 7, showing cell-nests cut across with reticulum. 

 Most of the cells have been displaced, only a few 

 nuclei to be seen x 310. 



Fig. 9 — Junction of mesenteron with foi'e-terminal canal (pro- 

 ctodseum) x 70 ; C.C. point of origin of chitinous 

 cuticle, which, at a near distance becomes setose. 



Fig. 10. — An intestinal villus pointing into the lumen; situated 

 on ventral floor of mid-term, canal. After macera- 

 tion in caustic potash solution x 320. 



Fig. 11. — Oblique section of a similar villus to Fig. 10, showing 

 three blood cells in the crypt. Rabl's fix. Hsematox. 

 oil im. X 680. 



