NATURAL SCIENCES OF PHILADELPHIA. 913 
Marginals low, wide, the broad reflection equalling the base of 
attachment and irregularly denticulated, as in Pupa. 
There are two European species of this subgenus, H. aculeata 
and lamellata, whose jaw is described by Lehmann as rather 
striated than ribbed. ‘Their lingual dentition presents no sub- 
generic differences from that of harpa, though the cusps of the 
centrals are described as simply conical. 
Subgenus VALLONIA. 
Jaw low, wide, slightly arcuate, ends but little attenuated, 
blunt; cutting margin without median projection; anterior sur. 
face with numerous crowded, broad 
Fig. 55. ribs, denticulating the lower margin. 
LLL i (Fig. 55.) 
Zo. Lingual membrane (pl. X VIII.,-fig. 
Jaw of Helix pulchella. [Morse.] 6) long and narrow. Morse gives 13 
rows of 11—1—11 teeth, with 3 perfect 
laterals. I counted 10—1—10, with 3 perfect laterals. Centrals 
with the base of attachment long and narrow, expanded and 
‘ notched at the outer lower 
angles, narrowed above and 
reflected ; reflection very small, 
tricuspid, all the cusps bearing 
very short cutting points, the 
central one, as usual, longest. 
Laterals with the base of at- 
| . tachment twice as broad as in 
the centrals, the inner lower angle suppressed, notched at the 
outer angle, broadly reflected above; reflection larger than in 
the centrals, with one inner, long, slender cusp, reaching nearly 
the lower edge of the base of attachment, its cutting point quite 
reaching it, and one small outer side cusp, also bearing a distinct 
cutting point. Marginals low, wide, the reflection equalling the 
base of attachment and irregularly denticulated along its edge, 
the inner cusp the longest and bifid. The dentition is quite that 
of Pupa. | 
The above description is drawn from a specimen from Maine. 
The European form is figured by Moquin-Tandon with a median 
projection to the cutting edge of its jaw. Lehmann also figures 
Fig. 56. 
Lingual dentition of Helix pulchella. [Morse ] 
