249, PROCEEDINGS OF THE ACADEMY OF 
Jaw with about ten ribs; as usual in the subgenus.! 
Lingual dentition as usual.! 
HELIX FALLAX, Say. (TZ rtodopsis.) 
Philadelphia, Munroe Co., Tenn. Miss Annie H. Law. 
Lingual membrane and jaw as usual in Vriodopsis, the latter 
with about fourteen ribs. 
HELIX TRIDENTATA, Say. (Zriodopsis.) 
Same locality as last. 
Jaw as usual in the subgenus.! 
Lingual membrane already figured by us. (1. ¢. fig. 220, p. 130.) 
Heiix Horperonensis, Shuttleworth. (7Zriodopsis.) 
Charleston, 8. C. Mr. W. G. Mazyck. 
Jaw with over ten ribs; as usual in the subgenus.* 
Lingual membrane as usual. 
HELIX DENTIFERA, Binney. (Mesodon.) 
Mohawk, New York. Dr. James Lewis. 
Jaw with fourteen ribs; as usual in the subgenus.’ 
Lingual membrane as usual.? The marginal teeth remind us of 
those of Helix thyroides (1. c. p. 148, fig. 252), but the inner den- 
ticle is more obtusely pointed. The figure referred to is liable to 
mislead. The marginals are subquadrate (not aculeate), with one 
long, oblique, sharply pointed denticle, much more produced than 
usual in the genus. ; 
HeELIx RommMert, Pfr. (Mesodon.) 
Bosque Co., Texas. Mr. Hugo W. Ericsson. 
_ Animal externally as in H. thyroides, dentifera, etc. 
Jaw and lingual membrane as usual in the subgenus,’ the former 
with over seven ribs. 
HELIX ELEVATA, Say. (Mesodon.) 
Philadelphia, Munroe Co., Tenn. Miss Annie H. Law. 
1 In Triodopsis the jaw is arcuate, ends blunt, anterior surface with 
stout, adjoining ribs, which denticulate either margin. See our fig. 214, p. 
127, 1. c. For lingual dentition, see fig. 215. , 
2 In Mesodon the jaw is arcuate, ends blunt; anterior surface with stout, 
separated ribs, denticulating either margin. See our fig. 281, on p. 187, 
l.c. The lingual dentition is figured on p. 138, fig. 232. The central and 
lateral teeth are obtuse, short, stout, with obsolete side denticles to the re- 
flected cusps. 
