THE NAUTILUS. 



VOL. XX. JANUARY, 19O7. No. 9. 



MOLLUSKS OF CAZENOVIA, N. Y. 



BY JOHN B. HENDERSON, JK. 



The village of Cazenovia, Madison Co., N. Y., about 20 miles 

 southeast of Syracuse, is upon the northern edge of the elevated 

 plateau of central New York. It is surrounded by hills more or less 

 wooded which in conformation form series of north and south valleys 

 of considerable depth, in one of which lies Cazenovia lake, with the 

 village at its southern end. At the altitude of Cazenova (1100 ft.) 

 the sedimentary rocks are shaly, but about two hundred feet below a 

 white limestone appears. The hills are grooved by deep ravines, 

 cutting many feet down into the limestone. These ' Gulfs " as they 

 are locally called, are heavily wooded, always damp, and offer excel- 

 lent collecting-grounds. Within a radius of a mile about the village 

 many types of station can be found with favorable soil, forest, stone, 

 and moisture conditions. 



Messrs. Pilsbry, Walker, Clapp and the writer enjoyed a three 

 days' collecting trip through the Cazenovia valley, and the following 

 catch, remarkable in the number and quality of specimens, was made. 

 Comparatively little time was given to the lake. 

 Vallonia pulchella Mull. Polygyra thyroides Say. 



" excentrica Sterki. " fraterna Say. 



Polygyra tridentata Say (small). Strobilops labyrinthica Say. 



" sayi Binn. Bifidaria contracta Say. 



" albolabris Say. Vertigo pygmsea Drap. 



" " dentutx (Walker). " gonldi Binn. 



" dentifera Binn. " ventricosa elatior Sterki. 



" palliata Say. Gochlicopa lubrica Miill. 



