Synopsis Frksh-Water Moixusca 



Fig. 2 

 Type: L. stagnalis h. 



Example: L. sfagnolis apprcssa Say, fig. i. Radula, fig. 2. 



Subgenus PSEUDOSUCCINEA Baker, 1908. 



Shell thin, succineif orm ; spire short; body-whorl large, 

 elongated, not inflated ; surface sculptured with spiral, incised 

 lines ; axis gyrate. 



"Prostate long, jiarrowly cylindrical with a slight 

 bulbous termination ; penis thick, about half as long 

 as penis-sac ; lateral teeth bicuspid." 



Fig- 5 



Fig. 4 

 Type: L. cohtnidla Say, fig. 3. Radula, fig. 4. Jaw, fig. 5. 



Fig. 6 



Subgenus RADIX Montfort, 1810. 



Shell thin, globose-oval; spire short, acute; body- 

 whorl large, inflated ; aperture very large ; lip ex- 

 panded. 



"Prostate short, pear-shaped when viewed lateral- 

 ly ; penis very slender, longer than penis-sac; first lat- 

 eral tooth tricuspid, balance bicuspid." 



Fig- 7 

 Type: L. anricnlaria L., fig. 6. Radula, fig. 7, 



