188 PROCEEDINGS OF THE ACADEMY OF 
c extreme marginal)—a Charleston specimen. There are 38—l— 
38 teeth, with 11 perfect laterals. 
S. subula, Pfr. (pl. XV., fig. 8, b is an extreme marginal). There 
are 24—-1—24 teeth, with 6 perfect laterals. 
Genus PUPA, Drap. 
I have personally examined the jaw and lingual membrane in 
only two species, P. fallax (pl. XV., fig 12) and P. rupicola (pl. 
XV., fig. 2). For information about the other species I am in- 
debted to Mr. Morse, whose figures are copied below. 
The jaw is low (in P. 7wpicola, pl. XVI., fig. 7, strongly arched), 
wide, arcuate ; ends but little attenuated in muscorum, pentodon, 
fallax, rupicola; acutely pointed in corticaria ; a more or less 
developed, broad, blunt median projection to the cutting edge; 
anterior surface without ribs, but generally with vertical strie. 
3 Figure 29 gives a general 
view of the,arrangement of 
the teeth on the lingual mem- 
brane. PI. XV., fig. 2, shows 
more correctly the charac- 
ters of the individual teeth 
of the genus. The mem- 
brane is long and narrow, the teeth are as in the genus Vertigo 
described below; excepting that in Pupa the central tooth is quite 
small in proportion to the laterals. The marginal teeth are ir- 
regularly denticulated, the inner denticle the largest. 
Fig. 29. 
gore . 
ceeencene 
P. museorum. {[Morse.] 
Fig. 30. Fig. 31. 
fees 
Lingual dentition of Pupa pentodon. Lingual dentition of Pupa corticaria. 
[Morse. ] [ Morse. ] 
P. muscorum (see fig. 29 above), has 90 rows of 14—1—14 teeth, 
with six perfect laterals. The figure and description of Lehmann 
of the European P. muscorum, confirm my belief in the identity 
of the two forms. 
