312 Animal Biology 



,, , ... Ligamentous hinqe 

 Ventral Siphon -^ 



I lior 5 q\ siphon 

 I 



Umbo 



_, 7 Growth linzs 



ypctnded 

 %ot 



Posterior adductor 

 musclz 



/Interior adductor 



Ij---'- ~-:^i/-Anterior 

 protractor 

 y&. retractor 

 muscle 



PaHial Urn 



Fig. 118. — Fresh water clam (Lampsilis anodontoides) of the phylum Mollusca, 

 class Pelecypoda. External, A, and internal, B, shell features. (From Potter: 

 Textbook of Zoology, The C. V. Mosby Co.) 



Kidney- 



Ven trick. 

 Auricle 



Pulmonary vein 



iver 

 Hermaphroditic duct 

 -0 I/O test is 



C!:^^?^^&^2^ Seminal receptaclj 



Tentacl'e 



Salivary duct- 

 Buccal mass 



Vas deferens 

 Oviduct 



hdutb I 'Cenitai }>oTe\'^i^)na\Kr>hs\ hucoas glands 

 Pedal ^an^l/a Penis Fla^ellufT) ^Oart sac 



Fig. 119. — Internal anatomy of a snail {Helix sp.) with shell removed. (From 

 Potter: Textbook of Zoology, The C. V. Mosby Co.) 



