Baker — The Molluscan Fauna of Western New York. 85 



81C. P. TRIDENTATA BIDENTATA Var. nOV. (Plate X. fig. 2.) 



Station 1 . Characterized by a perfectly smooth parietal 

 wall and two teeth on the peristome, similar to those of 

 typical Iridentata. A half dozen specimens of this form have 

 been seen. 



81d. P. tridentata unidentata var. nov. (Plate X. fig. 5. ) 



Station 1. In this form, of which a number of specimens 



have been seen, the peristome is perfectly plain and rounded, 



and the parietal tooth is small and points toward the upper 



part of the peristome. 



81e. P. TRIDENTATA EDENTILABRIS PilsbrV. 



In this form (of which no specimens were found at this 

 locality) there are no lip teeth.* 



*81f. P. TRIDENTATA FRAUDULENTA Pilsbry. 



This is the fallax of most authors, but, according to Mr. 

 Pilsbry, it is not the true fallax of Say, which is the intro- 

 ferens of Bland. It is characterized by a very heavy parietal 

 tooth, a large bifid upper tooth on the peristome and a much 

 smaller tooth on the base of the latter. The teeth nearly fill 

 up the aperture. f 



Genus Punctum Morse. 

 f82. Punctum pygmaeum minutissimum Lea. 



Family Pupidae. 



Genus Strobilops Pilsbry. 

 Strobila Morse. 



*f83. Strobilops labyrinthica Say. 



* See Pilsbry, The Nautilus, 7 12 : HO. 1894. 



t The Tachea hortensis Miiller, recorded by Mr. Walton, should not be 

 included in the list of Western New York shells, because it was a stray 

 specimen which had gotten away from Vick's greenhouse. 



