188 PROCEEDINGS OF THE ACADEMY OF [ 1876. 
Helix monodon, Rackett. 
Indiana. Mr. F. Stein. y 
Genitalia (pl. VI., fig. Q) characterized especially by a very un- 
proportionally large penis sac, which is long, club-shaped, greatly 
enlarged above, where it receives the vas deferens and retractor 
muscle. The genital bladder is elongate-oval, small, on a short, 
delicate duct. The epididymis is convoluted throughout its length. 
Polygyra Postelliana, Bland. 
Charleston, S.C. Mr. W. G. Mlerpile 
Genitalia as in P. auriculata. (See Leidy in Binney’s Terr. 
Moll. U.S. L) 
Jaw as usual in the genus: over 12 ribs. Lingual membrane 
(pl. VI., fig. z) asin P. Hazardi. (See Proc. Acad. Nat. Sci. Phila., 
1875, pl. viii., fig. 5.) The change from laterals to marginals is 
very gradual, and formed without the splitting of the inner cutting 
point. There are 21—1—2]1 teeth with about 7 laterals. Extreme 
marginals are shown in 0. | 
Polygyra Dorfeuilleana, Lea. 
A dried specimen long preserved in my cabinet furnished the 
lingual membrane here described. 
Teeth (pl. VI., fig. vu) 20-—1—20, with 9 laterals, the tenth tooth 
having its inner cutting point bifid. Base of attachment subequi- 
lateral of central and lateral teeth. All the teeth of same type 
asin P.auriculata. (See Ann. Lye. of Nat. of N. Y., XI., pl. xviii., 
fig. E.) 
Polygyra avara, Say. 
Banks of St. John’s River, Florida. Mr. Chas. Dury. 
It is with peculiar satisfaction that I give these details, as it is 
one of our rarest species. 
Jaw as usual in the genus, with over 12 ribs. (See Proc. Acad. 
Nat. Sci. Phila., 1875, p. 201.) 
Lingual membrane as usual in the genus (see same, p. 202). 
The change from laterals into marginals is shown in the 9th tooth, 
which is the first having a bifid inner cutting point. There are 
17—1—17 teeth. Pi. VI., fig. y. 
Caracolus sagemon, Beck. 
Gonave Island. Prof. Linden to Mr. Bland. 
On pl. B, fig. ae, I figure the dentition of the specimens described 
in full by Mr. Bland in Ann. Lye. Nat. Hist. of N. Y., XI, 197 
(1879). 
