Pulmonifera of Maine. 41 



Gyraulus hirsutus, Gould. 

 Quite rare ; I collected specimens at Eagle Lakes, in the north- 

 ern part of the State. 



Gyraulus deflectus, Say. 

 Occurs at Norway Pond, very rare. 



Gyraulus parvus, Say. 

 Profusely distributed throughout the State, occurring in almost 

 every muddy brook, ditch, and puddle. 



Gyraulus diJatatus, Gould. 

 A few sj^ecimens only have been found in Harrison, Maine. 



Menetus exacutus, Say. 

 Nearly as rare as the preceding species. 



LIMNiEIN^. 

 Limnophysa desidiosa, Say, 



Abundant in every small body of water. 



The young of this species were plainly seen eating their way 

 out of the ovai'ian envelope, the mouth seemed to occupy the 

 whole space between the eyes which were wide apart. The 

 lingual membrane of the young just issued from the eg^, is long 

 and narrow, composed of thirty-eight rows of plates, each row 

 made up of one minute central plate, flanked by four laterals on 

 a side. 



A specimen of this species tightly corked in a vial of water 

 showed signs of uneasiness after three hours had elapsed ; at the 

 expiration of seven hours the animal was greatly exserted from 

 the shell, showing slight motion though apparently insensible to 

 touch. 



Limnophysa elodes, Say. 

 Of rare occurrence in the State. 



