7. > 
ine % # 
Mollusca of Middlebury, Vit. and Vicinity. © ~ 273 
Foreman, of Baltimore, I have received specimens collected at 
Charleston, S.C. At many intermediate | places it has been found 
by numerous observers. * rt 
Hi. Sayti, Binney. This species is very rare here, only one 
good specimen, and a few partially decayed, haying been found. 
41. tridentata, Say. This species is not common in this re- 
gion. Its size is less than that of specimens from the western 
States. r : 
#1. labyrinthica, Say. This singular little species is not rare. 
H. indentata, Say. This species is rare. The animal is re- 
markable for being of a rather light blue color. 
_ Ef. arborea, Say. This species is very common. It inhabits 
both dry and wet lands. In the former situation the shell is of a 
pale horn color ; in the latter it is of a deep brown, and the ani- 
mal is black. The latter variety attains a greater size, some spe- 
cimens in my cabinet being .3 in. broad. 
H. inornata, Say. One specimen only has been obtained 
here. With this exception, I believe this species has not been 
found in New England. 
H. alternata, Say. This species is very common. At the 
Brothers’ Islands, it attains its greatest size, some specimens being 
one inch in diameter, . 
4H. chersina, Say. In April, 1839, this species was found in this 
town. Not long after it was found near Boston. It is not rare. 
H. lineata, Say. This species is not rare. It is of a beautiful 
light green, and is remarkable for its resemblance to a Planorbis. 
H. siriatella, Anth. This species, long confounded with H. 
Perspectiva, Say, which does not occur in New England, was 
recognized as a distinct species by J. G. Anthony, Esq. In 
this species the last whorl much exceeds the umbilicus in diame- 
ter, while in Say’s shell it is not more than equal to it. The last 
Whorl in the former is also much larger. Less essential differ- 
ences are that Say’s species is larger, uusally of a darker color, 
and that it has the striee more elevated. The striatella is quite 
common here. é 
H. fuliginosa, Griffith, is rare in this part of Vermont. 
- electrina, Gould, in Binney’s Monog. This species was 
discovered by me im»Marion Co., Mo., in Nov. 1837. In August, 
following, Col. A. Bourne, of Chillicothe, Ohio, forwarded to me 
Specimens from that place. Subsequently I have found it in this 
‘own and at Rogers’s Rock, Lake George, and Dr. Gould has 
r 
