230 ANCYLUS. 



Spurious Species. 



ANCYLUS PATELLOIDES, Lea. 



This shell, described and figured by Dr. 

 Lea in "Observations," etc. vol. xi, and said 

 to be from. Sacramento River, is so evidently a 

 marine species belonging to Patellidce or its 

 allies, that I have not deemed it necessary to 

 include the description in my monograph. 



ANCYLUS DROUETIANUS, Bourgidgnat. 



This is certainly not a North American 

 species, judging from description and figure. 



(24) 



