190 PROCEEDINGS OF THE ACADEMY OF 
siana (fig. 35) has 88 rows of 12—1—12 teeth, with 6 perfect late- 
rals. A comparison of this description and figure with that of 
Lehmann, pl. XIV., fig. 53, will prove that this species cannot be 
identical with P. pygmxa of Europe, as has been suggested by 
Mr. Gwyn Jeffreys (Ann. Mag. Nat. Hist., 1872, 246). 
Fig. 34, Fig. 35. 
(=) cA SF? 
ey ale 
peace” 
| Lingual dentition of Vertigo Gouldi. Lingual membrane of Vertigo Bollesiana. 
[ Morse. ] [Morse. ] 
V. milium, not observed. 
V. ovata (see above figure 33) has 90 rows of 14—1—14 teeth 
apparently with 9 perfect laterals. The species has been referred 
to P. antivergo, but the figure of the dentition of that species given 
by Lehmann (pi. XIV., fig. 52) does not sustain the theory of iden- 
tity. 
V. ventricosa has 98 rows of 18—1—13 teeth, with 6 perfect 
laterals (fig. 36). 
V. semplex, not observed. 
Fig. 36. 
(MAAS 
cpm 
ARAQQAAN : 
Lingua] membrane of Vertigo ventricosa. [Morse.] 
Genus STROPHIA, Albers. 
But one species, S. zncana, Binn., is found within our limits. I 
have found it to agree in the characters of its jaw and lingual 
membrane with the extralimital species which I have examined, S. 
tostoma, mumia, and decumana. Semper, however (Phil. Arch. 
128), describes the jaw of S. wva as being without median projec- 
tion to its cutting edge; that character, therefore, 
cannot be considered generic. : 
Jaw of S. incana (fig. 37) arcuate, thick, coarse, 
of about equal height to its bluntly truncated ends: 
cutting edge with a slightly produced median pro- 
jection. Anterior surface without ribs. | 
Fig. 38 shows the general arrangement of the teeth upon the 
Fig. 37. 
Jaw of 
S. incana. 
