272 Mollusca of Middlebury, Vi. and Vicinity. 
This species was not “ first discovered” by Dr. Gould, as claim- 
ed by him, (op. cit.,) but was discovered in July, 1839, by Mr. 
Sheldon. I supposed, until the publication of Dr. G.’s descrip- 
tion, that it had long been known to him, and the privilege of 
describing it was tacitly yielded to his claim of discovery. 
HE tix. “ 
H. albolabris, Say. This species is every where found, but is 
most abundant in company with Succinea obliqua, Say, at the 
Brothers’ Islands, and in the same company on an island near the 
N. E. extremity of Lake George. A pink variety is rare. This 
species sometimes attains a size of 1.35 in. in its greatest diam- 
eter; but another mature specimen, from a different locality, is 
only .9 in. in its longest dimension. A specimen from Cincin- 
nati, which I received from my friend J. G. Anthony, Hsq., very 
nearly approaches in size to H. major, Binney, being 1.4 in. broad. 
H. thyroidus, Say. Only three or four specimens of this spe- 
cies have been found in this vicinity. They had a tinge of pink. 
H. palliata, Say. This species is as rare here as the prece- 
ding. * 
HI. monodon, Rack. and H. fraterna, Say. These species are 
common on hill sides. In some specimens now before me the 
umbilicus is entirely covered by the reflected lip, which is char- 
acteristic of the fraterna ; but others have it scarcely encroached 
upon by the lip, and are therefore the monodon. As the very 
numerous specimens, which I have collected, present every inter- 
mediate condition, as well as also in respect of size and elevation 
of the spire, and especially as their gradations in these particulars 
are by no means parallel, I have not been able to find two species 
among them. With such authorities, however, as Say and Bin- 
ney, for their specific difference, I cannot but distrust the cor 
rectness of my conclusion. 
H. concava, Say. This species is rare in this vicinity. 
H. pulchella, Mill. This species is very abundant in this 
town, so that I have taken eleven hundred specimens in one 
hour. The shell is stouter than in many other parts of the coun- 
try. The species is remarkable for its very extensive geographi 
distribution. It is well known as a native of Great Britain and 
of a large part of Europe. In this country, it has been found in 
Maine by Dr. J. W. Mighels, of Portland, and was seen by Say 
as far west as Council: Bluffs, on the Missouri river ; from Prot 
