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 precisely the same in character as the 
series alluded to, and, like them, are labeled C. glauca, Say. Asa 
matter of fact the peculiarly arched forms known as C. convexa are 
very rare on our immediate coasts, while those described as O. 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 New 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 proves 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 DW. SS. LHATOR: 
(Continued from February No.) 
More careful hunting under the logs will bring to light good 
specimens of Zonites arboreus, indentatus, and viridulus; the last 
two rather scarce. Also a few Zonites fulvus, H. labyrinthica and 
