& 
Jaw and Lingual Dentition of Pulmonata. 176 
Laterals like the centrals, but unsymmetrical: the cutting point becomes 
longer as they pass off laterally, and at the 12th tooth it commences to be 
bluntly trifid. The marginals are peculiar; their base of attachment is 
' subquadrate with a single broad cusp, bearing a very broad, oblique, ex- 
panding, trifid cutting point; the outer division very small, pointed; the 
median longer, very broad, squarely truncated; the inner one about half 
the size of the median, recurved and sharply pointed. 
In pl. xiv, fig. A, I have represented the dentition of that portion of 
the lingual membrane where the cutting points are least developed. PI. 
xv, fig. A, represents that portion where they are most so.. It must 
always be borne in mind that such differences of development exist in all 
membranes. 
The dentition of this species is peculiar, resembling that common in 
Orthalicus rather than the type usual in Helix. 
Helix leporina, Gould (Polygyra). 
Texas. Mr. A. G. Wetherby. 
Jaw as usual in the subgenus (see Phila. Proc. 1875, 201), with 12 
ribs. 
Lingual membrane as usual in the subgenus (see id.). Teeth 18-1 -18, 
with 8 laterals (pl. xviii, fig. B). The 15th tooth figured is from another 
portion of the membrane from that furnishing the 18th. The extreme 
right hand figure of my plate represents a deformed first lateral tooth. 
Helix auriculata, Say (Polygyra). 
St. Augustine, Florida, under the ruins of the sugar house 
chimneys at Hanson’s deserted plantation. 
Having collected specimens of undoubted identity at Mr. Say’s original 
locality, I have compared the genitalia with those figured by Leidy (Terr. 
Moll. U. S., I. pl. ix) and find them to agree. This is important, as the 
name ‘‘ auriculata” was used in that work to cover several species. 
I have also given (pl. xviii, fig. E) a better figure of the dentition 
than in Proc. Phila. Ac. Nat. Sc., 1875, pl. viii, fig. 12. There are 26-1-26 
teeth. The inner cutting point of the 13th tooth is bifid, so that there are 
12 laterals. 
Jaw with 10 ribs. 
Helix uvulifera, Shuttl. (Polygyra). 
Genitalia as in H. auriculata. 
Helix septemvolva, Say (Polygyra). 
St. Augustine, Florida. 
Plate xii, fig. 6, represents the genital system of the large form of this 
