EXPLANATION OF PLATES. 



ABBREVIATIONS. 



a. 

 ap. 



app. 



hg. 

 hi. 



bm. 

 bm. ocm 



br. 



bv. 



cac. 



ci. 



cm. 



cso. 



ct. 



dc. 



dg. 



dm. 



dn. 



dn'. 



dv. 

 e. 



ec. 



eep. 



emp. 



en. 



e.o. 



ft- 

 fo. 



gl. 



i. 



ic. 



icm. 



id. 



iep. 



in. 



inf. 



Im. 



Imp. 



See explanation of figure. 



Attachment of proboscis. 



Appendix of esophageal 

 caecum. 



Basal glands of integument. 



Blood lacuna. 



Basement membrane. 



Basement membrane and 

 outer circular muscles. 



Brain. 



Blood vessel. 



Cardiac caecum. 



Cilia. 



Circular mu.scles. 



Cerebral sense organ. 



Connective tissue. 



Dorsal commis-sure. 



Dorsal ganglion. 



Diagonal muscles. 



Dorso-median nerve. 



Internal dorso-median 

 nerve. 



Dorsal blood vessel. 



Esophagus. 



Esophageal caecum. 



Epithelium of esophagus. 



Muscle for eversion of pro- 

 boscis 



Esophageal nerve. 



Opening of esophagus into 

 stomach. 



Flagella. 



Follicle ; follicular epithe- 

 lium. 



Gland cell. 



Integument. 



Intestinal caecum. 



Inner circular muscles. 



Intestinal diverticulum. 



Intestinal epithelium. 



Intestine. 



Folds of intestinal wall. 



Longitudinal muscles. 



Longitudinal muscle plate 

 beneath proboscis sheath. 



