EXPLANATION OF PLATE Y. 



FiCr. 1. — LoDgitucliual median section of Caloi)tenns femur-ruhrum, female, to show the 

 course and divisions of the digestive canal ; M, mouth ; Oe, oesophagus ; C)'\ 

 anterior, Cr-, posterior part of crop ; P, proventriculus ; Div., blind sack or 

 diverticnlum of the stomach; i'en, ventricle ; iZ, ileum ; Col, colon; E, rec- 

 tum ; An , anus. 



Fig. 2. — Optical section of Malpighian tube. 



I'^iG. :>. — Section of the epithelium of the rectum of CaJoptenus spretus. 



Fig. 4. — Transverse section of the hind part of the crop; s s, spines of the cuticula; 

 rid, ridges ; L, longitudinal ; muc. C\ circular muscular coat. 



Fig. 5. — Epithelium of the ileal folds; A, middle of folds; J5, furrow between folds; 

 X, longitudinal muscular band. 



Fig. 6. — Ex)ithelial cells of the gastro-ileal valve of (Edipoda sordida. 



Fig. 7. — Surface view of the gastro-ileal valves ; Ven, ventricle ; Bd, circular muscular 

 band underneath the folds ; II, ileum. 



Fig. 8. — Transverse section-of a diverticulum; Tr, trachea; «t««c, circular muscular 

 coat. 



Fig. y. — Transverse section through the furrow ; 1^\ between two ileal folds ; en, cuti- 

 cula ; Ej), epithelium ; conn, connec ive tissue; muc. C, circular muscles; i. 

 longitudinal muscular bands. 



Fig. 10. — Transverse section of the gastro-ileal folds of (Edipoda sordida; muc, muscular 

 band, Bd, of Fig. 7. 



Note. — For the permission to use this plate we are indebted to the jjublishers of the 

 American Xatm'cdist, where it first appeared in June^, 1878. 



