vin 



TRANSVERSE SECTIONS 



405 



FIG. ioi.~-Aiiodonta. Three transverse sections (x ij). A, through the anterior 

 part of the visceral mass. 13, through the posterior part of the visceral mass. 

 C, through the posterior adductor muscle. 



(tu. auricle ; bl. urinary bladder ; e*t. gl. external gill-lamina ; ft. foot ; i. /. j. 

 inter-lamellar junction ; int. intestine ; int. gl. internal gill-lamina ; kd. kidney ; 

 k. o. pericardial gland ; Ig. ligament ; m. mantle ; p. ad. posterior adductor ; 

 pc. pericardium ; 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.) 



