270 Mollusca of Middlebury, Vt. and Vicinity. 



P. elevatus, nob. This species does not differ much from 

 some varieties of the preceding, and perhaps may not prove enti- 

 tled to rank as a species. All the specimens which I have seen, 

 however, present that constancy of difference which is most im- 

 portant in distinguishing species. One or two specimens have 

 been found in a swamp at Ticonderoga, N. Y. 



P. hirsutus, Gould. This species, common in the vicinity of 

 Boston, is rare in this region. It is found in company with P. 

 exacutus. 



P. de/lectus, Say. A very few specimens have been found, in 

 company with Valvata sincera. 



SUCCINEA. 



S. obliqua, Say. This species is frequently confounded, as 

 perhaps it should be, with »S'. campestris, Say. In the Western 

 States this shell is of a pale horn color, but in this vicinity it is 

 of a deep shade of amber. It is common in low grounds under 

 stones and wood. On the Brothers' Islands, opposite Burlington, 

 Prof. Benedict has found very large specimens, one of which in 

 my cabinet is .97 in. long, and .55 in. wide. The animal is more 

 or less thickly mottled with dark purple. In October a thin trans- 

 parent epiphragm is formed. 



iS". ovalis, Say. This very fragile species is found only very 

 near water. In low ground, which is covered with a species of 

 flag, and overflowed by Lake Champlain in the early part of 

 summer, I have seen them in immense numbers on the upper 

 part of the flags. /S*. putris of Europe is intermediate in form 

 between this and the preceding species. 



S. avara, Say. This species is the young of S. vermeta, Say. 

 At this age a viscid substance attaches dirt to the shell, which 

 becomes clean in a mature state. As the young was first de- 

 scribed, the name of the adult must be rejected. This species is 

 found in the same station with /S. obliqua, and in this region is 

 rather rare. 



BULIMUS. 



B. lubricus, Drop. This species is remarkable for its exten- 

 sive geographical distribution, being dispersed over a large part of 

 Europe. It is rather common in this vicinity, has been found in 

 great abundance near Boston by Dr. Gould, and was seen near 

 Lake Winnipeck and the Lake of the Woods by Say. With 

 equal propriety the species has been referred to Achatina, but as 



