Anatomy of Cyclostoma elega7is. 283 



Tab. Supp. xxxiv. 



Explanation of the Figures. 

 N.B. All are more or less magnified. 

 Fig. 1. Male removed from the shell. 



2. Represents the upper surface of the branchial cavity. 

 a. a. the muscle of attachment divided. 

 h. b. the edge of the mantle. 



c. rectum. 



d. anus. 



e. sac of viscosity. 

 /. pericardium. 



g. g. vena cava. 

 h. trunk of pulmonary veins. 

 i. auricle. 

 k. ventricle. 

 Fig. 3. Auricle and ventricle divided to shew their internal structure. 

 i. auricle. 

 k. ventricle. 



Fig. 4. 



Fig. 5. 



I. oesophagus. 

 TO. lower portion of sac, the liver being removed. 

 n. upper portion, 

 o. first turn of intestine. 

 p. second turn. 



c. rectum. ^ 



d. anus. 



q. portion of testicle confluent with liver. 

 r. filamentous portion. 

 s. subglobose portion. 

 t. vas deferens. 

 u. penis. 



V. oviduct. 



w. posterior portion of matrix. 



X. anterior portion. 



c. rectum. 



d. anus. 



