A Typical Univalve Mollusk 



SOFT PARTS OF A UNIVALVE 



(Mantle chamber laid open) 



Pyrula sp. 



proboscis 



tentacles 



foot 



siphon 



mantle 



mantle chamber 



osphradium 



gills 



oesophagus 



heart 



ntestine 

 d, duct of male reproductive gland 

 k, kidney 

 It, liver 



or, female reproductive gland 

 ar, male reproductive glanJ 



/, 

 /. 

 ^1 



tn, 



m-c, 



o, 



S, 



y, 



h, 

 i, 



A single row of teeth across the radula 

 ol HeliciiM convexa, Troschel 



a, central, or rachidian tooth (i) 



b, lateral teeth (4) 



c, uncini, or marginal teeth (50 or more) 1 

 Formula: 50.4.1.4.50 C_ 



22 



