TRANSVERSE SECTIONS 



405 



rcb 



FIG. 103. Anodonta. Three transverse sections. A, through the anterior part of 

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

 the posterior adductor muscle. 



au. auricle ; bl. urinary bladder ext.gl. external gill ; ft. foot ; i. l.j. inter 

 lamellar junction ; int. intestine; int. gt. internal gill; /W. kidney; k. o. peri 

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

 dium ; ret. rectum ; .s. br. c. supra-branchial chamber ; sh. shell ; ty. typhlosole 

 v. ventricle; v. c. vena cava ; v.gn. visceral ganglion, v. m, visceral mass 

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



