TRANSVERSE SECTIONS 



391 



sh. 

 9.hr. c 



Fig. q^, — Anodonta. Three transverse sections. A through the anterior part of 

 the visceral mass ; B, through the'posterior part of the visceral mass ; C, through 

 the posterior adductor muscle. 

 «M. auricle; bi. urinary bladder; ext.gl. external %\\\\ ft. foot; i.I.j. inter- 

 lamellar junction ; int. intestine; int.gl. internal gill; /.v/. kidney ; k.o. peri- 

 cardial gland ; Ig. ligament ; vt. mantle ; p. ad. posterior adductor ; pc. pericar- 

 diurn ; ret. rectum ; i-. br. c. supra-branchial chamber ; s/i. shell ; ty. typhlosole ; 

 ?'. ventricle; 7'. c. vena cava; v.g?i. visceral ganglion, z/. vz, visceral mass. 

 (Krom Parker and Haswell's Zoology, after Howes, slightly altered.) 



C C 2* 



