ULLETIN 



OF THE 



rooklyn Concnological Club 



VOL. I. NEW YORK, NOVEMBER, 1907. No. 1. 



NOTE. This number of the Bulletin comprises papers read before 

 the Club in May, June and September, 1907. With us the word 



conchology is not limited in meaning to the study of shells only, but 

 extends to the study of mollusks in general, both recent and fossil ; 



and the word shell is often used as as synonym of mollusk. 



Abnormal Shells 



BY S. C. WHEAT. 



A specimen of Pyramidula alternata Say (fig. 5) found near Ithaca, 

 N. Y., is turreted, the suture being placed far below the carina of the 

 preceding whorl. The carina is unusually sharp. The animal was in 

 all outward respects normal. 



Another specimen (fig. 4) found in the same vicinity was flat, the 

 suture being above the carina and deeply impressed. 



A dead shell of Polygyra thyr aides Say (fig. 6) found on the 

 Palisades near Creskill, N. J., has a deep notch in the lip. The notch 

 begins at the periphery of the body whorl and extends downward to 

 the base. It is 3 mm. deep and 4 mm. wide. The glaze within the 

 lip and the lines of growth in the epidermis behind it are normal. The 

 denticle is in the usual position. 



Another specimen found alive at Summit, N. J., had formed a lip, 

 then carried the shell forward 5 mm. and formed a second lip. This 

 specimen has no denticle on the pilar lip. The shell between the two 

 lips has no epidermis, and has coarse wrinkles of growth that look like 

 attempts at forming lips. A similar specimen of P. tridentata is figured 

 in "Manual of Amer. Land Shells, Binney," p. 291. 



