THE NAUTILUS. 67 
NOTES ON VALVATA (LYOGYRUS) BROWNII. 
BY H. F. CARPENTER. 
This species was found abundantly in Cunliff’s Pond, at Elm- 
ville, three or four miles south of Providence, adhering to stones 
and empty valves of Unio complanatus. I discovered them in 1870 
and kept more than two hundred specimens alive all summer in a 
glass globe filled with water. I read a description of it under the 
name of Amnicola Brownii before a meeting of the Providence 
Franklin Society, Tuesday evening, Mar. 26th, 1872, and published 
the same in the “ Central Falls Weekly Visitor ” the following week. 
The specific name was given in honor of Dr. W. O. Brown, who 
was then President of the Society. Specimens was sent to the late 
Geo. W. Tryon, who pronounced them to be a new species of 
Valvata, subgenus Lyogyrus. Of late years they have been 
gradually growing scarcer and the last time I examined the pond 
I could find none, although I did not search very thoroughly. 
Specimens of these shells are in the collections of Mr. John Ford, 
of Philadelphia, Mr. F. C. Baker, Mr. J. M. Southwick and several 
other conchologists. The following is my original description: 
“Shell small, thin, translucent, of a light green color, when 
divested of the thick, dirty epidermis which covers it, turreted, 
elongate, composed of five gibbous whorls; operculated and umbili- 
cated; apex very obtuse; suture very deep; aperture nearly 
circular, a little broader at the base; lip continuous, simple, the 
superior edge of the inner lip not touching the preceding whorl, 
except in young specimens. Average size 75 inch in length, by 7¢ 
in breadth. Diameter of aperture j; inch. Full grown specimens 
which are rare, attain a length of 25 inch. 
ON ANODONTA FLUVIATILIS DILLW. 
The following letter received from Gen. de Peyster is interesting 
as showing the facility with which fresh-water mollusks become 
established in suitable spots. 
Upper Rep Hook, N. Y., Sept. 19, ’89. 
Mr. DE PEYSTER: 
Dear Sir: 
At Dover Plains, Eastern Duchess Co., N. Y., last week I secured 
sixty-three specimens of A. fluviatilis, including twenty-five or more 
