Molliisca of Middlebury, Vt. and Vicinity. 275 



am not aware that it has since been found, until the summer of 

 1839, when on an excursion to Rogers' Rock, near the N. E. ex- 

 tremity of Lake George, N. Y., I found a number of individuals 

 crawling among moist leaves. On a visit to the same place, last 

 autumn, a very few only were found. These specimens were 

 obtained in a niche in the rock, accessible only by water, within 

 the space of less than a square rod. A careful search in the 

 neighborhood enabled me to detect only one dead specimen, at 

 a distance of ten rods from the little colony. 



Although I have not seen specimens of the European shell, I 

 do not doubt that this is the same species, which is figured and 

 described by numerous authors. It differs only in being entirely 

 destitute of the tinge of green, which is mentioned by some of 

 them. It is perfectly hyaline, and for elegance of contour and 

 delicacy of aspect, cannot be surpassed. 



Anctlus. 



A. parallelus, Hald., Mss. This species has been supposed 

 to be Say's A. rivularis. with the brief description of which it 

 agrees very well. But my friend S. S. Haldeman, Esq. informs 

 me that it is distinct. It is rather common in Otter Creek, and 

 in a pond in the east part of Brandon. 



A. tardus, Say. Found rather plentifully in a brook in the 

 east part of this town. Mr. Prescott has also found it in the 

 southern part of this State. 



Two species of naked Mollusca, of the family Pulmonea ter- 

 restria, Cuv., are found in this region, which have a dense shield- 

 like mantle, covering the whole back, the branchial orifice on the 

 right side near the head, and the anus at the posterior extremity. 

 As the latter orifice does not communicate with the branchial 

 cavity, which is immediately behind the head, these species can- 

 not belong to the genus Vaginulus, Fer., to which I had at first 

 referred them on account of the extent of the shield-like mantle. 

 Not having the means here of ascertaining whether any genus has 

 been described for their reception, I am obliged to leave them. 

 One species is (after being preserved in spirit) 1| inches long and 

 i inch in diameter. The mantle is thickly mottled with a gray- 

 ish black, and the spots on the back are sometimes confluent. 

 The other species (also in spirit) is about ^ inch long and | inch 

 in diameter, and is of a nearly uniform blackish gray color. This 



