220 PROCEEDINGS OF THE ACADEMY OF 
As usual in most of the species of Helix, 
etc., examined by me, the number, size, and 
disposition of the ribs vary in different 
individuals of the only species of Huparypha 
I have examined, H. Tryont. In L. and Frw. 
Jour ORE emo Shells N. A., I., 179, six jaws are figured, all 
differing as to the ribs. 
I have had no opportunity of examining H. areolata, the only 
other species found within our limits. Among the species of the 
subgenus foreign to the United States, H. pisana, Mull., alone has 
been examined, the jaw being figured by Moquin-Tandon with 2-3 
ribs only, and the number of the teeth being given by Thomson. 
The only information I can give of the lingual dentition is shown 
in the figure of that of H. Tryoni (L. and Frw. Shells, I., 354). 
There are 190 rows of about 43—1—43 teetheach. There appear 
to be 16 perfect laterals. 
The base of attachment is long and narrow; the reflection is 
pear-shaped, apparently without side cusps or cutting points in the 
central and first nine laterals. The balance of the laterals have 
the side cusp, and, no doubt, cutting point. I cannot from the 
ficure describe accurately the characteristics of the marginal teeth. 
Unfortunately, I have preserved no membrane to describe and 
figure more accurately. 
Subgenus TAcHBA. 
Our single species, H. hortensis, found only along the north- 
eastern coast, and there usually restricted to the islands, agrees 
in its jaw with the other known species of the subgenus. It is 
stout, arched, with blunt unattenuated ends; 
anterior surface with stout, few, separated 
ribs, denticulating either margin. 
The lingual membrane has 116 rows of 32 
—1i1—32 teeth each. The centrals have a 
f subtriangular base of attachment, so greatly 
Jaw of Helix hortensis. 
[Morse.] are the lower lateral angles expanded; upper 
margin reflected; reflection pear-shaped, 
‘without outer cusps, but a single stout middle cusp, half as long 
as the base of attachment, and bearing a short, conical cutting 
point, reaching only about one-half the distance to the lower edge 
of the base of attachment.. First laterals like the centrals, but 
unsymmetrical by the irregular cutting away of the lower inner 
