THE NAUTILUS. 129 



It is possible, as Dr. Dall asserts, that the series in question are 

 depressed specimens of C. convexa ; — the extreme convex form of 

 which he supposes to be caused by growing on the rounded surfaces 

 of small univalves, but I do not think it at all probable. 



Quite a number of those in my own collection were taken from 

 small univalves but they are j^recisely the same in character as the 

 series alluded to, and, like them, are labeled C. glauca, Say. As a 

 matter of fact the peculiarly arched forms known as C. convexa are 

 very rare on our immediate coasts, while those described as C. glauca 

 are comparatively plentiful. 



Why should there be this disparity in numbers ? It surely cannot 

 be for the want of those "roosting conditions" so needful to the 

 growth of C. convexa, since it is well known that the small univalves 

 of our region greatly outnumber the large ones. 



Though many hundreds of the former have been examined by me 

 I have never seen a C. convexa upon them. I have also scanned 

 every available point on the Xew Jersey coast scores of times within 

 the last twenty-five years, and during all of that period have secured 

 but six specimens (all dead), corresponding to Say's description of 

 C. convexa. 



This fact of course j^roves nothing ; nevertheless, until further 

 evidence to the contrary is adduced I shall deem it prudent to con- 

 sider them two distinct and well-marked species. 



Should they, however, eventually prove to be the same, even 

 then, as my friend, Mr. H. A. Pilsbry, has stated, the name C. glauca, 

 having precedence over C. convexa in Say's original paper, must 

 always stand for the type form, and be entitled therefore to a " place 

 of honor " in all monographs of the genus. 



Young Collectors' Department. 



COLLECTING LAND SHELLS IN EASTERN NEW YORK. 



BY W. S. TEATOR. 



(Continued from February No.) 



More careful hunting under the logs will bring to light good 

 specimens of Zonites arhoreus, indentutus, and viridulus ; the last 

 two rather scarce. Also a few Zonites fulvus, H. labyrinthica and 



