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. 



Helix. 

 ^. ' H. albolabris, Say. This species is every where found, but is 

 most abundant in company with Succinea obliqiia, 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, Esq., very 

 nearly approaches in size to H. major, Bin?iey, 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. 



a. mojiodon, 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 frateriia ; but others have it scarcely encroached 

 upon by the lip, and are therefore the monodon. As the very 

 numerous specimens, which 1 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 diff'erence, I cannot but distrust the cor- 

 rectness of my conclusion. 



H. concava, Say. This species is rare in this vicinity. 



H. pulchella, Mull. 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 geographical 

 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 Bluflfs, on the Missouri river ; from Prof. 



