[Extracted from the Proceedings of the Academy of Natural Sciences of Philadelphia, 
March 25, 1873.] 
ON THE LINGUAL DENTITION AND JAW OF CERTAIN TERRESTRIAL 
PULMONATA FROM THE UNITED STATES, WITH REMARKS ON THEIR 
SYSTEMATIC VALUE. 
BY THOMAS BLAND AND W. G. BINNEY. 
The character of the jaw and lingual dentition of the various 
genera and subgenera of our land shells is now so well known, 
and apparently so constant, that we have not thought it necessary 
to give full descriptions in each case. We simply refer to a pub- 
lished description or figure under each genus or subgenus, unless 
some unusual feature has been observed. The number of ribs 
upon the jaw is given approximately when there is a difficulty in 
deciding whether certain stages of thickening of the material of 
the jaw shall be counted as rudimentary ribs or not. 
Macrocyciis DurANTI, Newcomb. 
Los Angeles, California, Mr. Henry Hemphill. 
On examining the lingual membrane, we find it does not agree 
with that of Hyalina or Zonites, but with that of Macrocyclis 
Vancouverensis, sportella and concava. The species must there- 
fore be recognized as a Macrocyclis. 
The jaw was injured in extraction and imperfectly examined. 
It seems, however, to have the usual characteristics of the genus. 
LIMAX CAMPESTRIS, Binney. 
New Jersey, W. G. Binney. 
Jaw and lingual membrane as usual in the genus. 
ZONITES LIMATULUS, Ward. 
Near Cincinnati, Ohio. Mr. A. G. Wetherby. 
The species has the longitudinal furrows along the side, above 
the foot, and the caudal mucus slit, as in Zoniles suppressus, 
(see our fig. 524 on p. 292 of Land and Fresh-water Shells of N. 
A., 1.) In two individuals examined we found the sac and dart 
as figured by Leidy in Z. ligerus (Terr. Moll., I, pl. xii. fig. 3). 
Jaw and lingual membrane as usual in the genus. 
VITRINA PFEIFFERI, Newcomb. 
Lake Tahoe, California, Dr. J. G. Cooper. 
Jaw and lingual membrane as usual in the genus (see our fig. 
21, 22, 0n p. 26,1.c.). About ten lateral teeth. Marginals bluntly 
bifid as usual. 
