Baker — The Molluscan Fauna of Western Neio York. 91 



will all prove to be synonyms of the present species, and 

 there are several other names which will probably have to be 

 added to this list: gyrina Say, elliptica Lea, aurea Lea, 

 8ayii Tappan, Troostiana Ijea, fonta?ia Hald., Hildrethiana 

 Lea, injlata Lea, cijUndrica Newcomb, anatina liea , Forsheyi 

 Lea, Saffordii Lea, Haunii Lea, parvaLtea, MckHnii Liea., 

 altonensis Lea, FeUgerii Lea, Warrenana Lea, Halei Lea, 

 Whiiei Lea, Grosvenorii Lea, lata Try on, primeaiia Tryon, 

 oleacea Tryon, coniformis Tryon, deformis Currier and 

 albofilaia Ancey. The above seems like a tremendous syn- 

 onymy, but it is probable that most, if not all, of these 

 names will stand as they are written. 



122. Physa ancillaria Say. 



Station 17. Rochester (Walton). This species is closely 

 related to heterosotropha , and it may be but a variety of that 

 species. It is always a wider and more robust form, and is 

 distinctly shouldered, the latter being a character lacking in 

 the former species. 



Genus Aplexa Fleming. 

 *123. Aplexa hypnorum Linne. Pittsford. 



Superorder Streptoneura. 



Order CTENOBRANCHIATA. 



Suborder Orthodonta. 



Superfamily Taenioglossa. 



Family Pleuroceridae. 



Genus Pleurocera Rafinesque. 



124. Pleurocera subulare Lea. 

 Stations 5 and 6. Common. 



Genus Elimia H. and A. Adams, 1854. 

 Goniohasis Lea, 1862. 



*125. Elimia virginica Say. Erie Canal. 



