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 Patellide or its 
allies, that I have not deemed it necessary to 
include the description in my monograph. 
ANCYLUS DROUETIANUS, Bourguignat. 
This is certainly not a North American 
species, judging from description and figure. 
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