98 THE LAND SNAILS 
is quite unlike its parent. They attain their complete 
growth, in from two to three years. 
HELIX THYROIDES Say. (Fig. 3). The shell of this spe- 
cies resembles very much that of Helix albolabris, but 
differs in being smaller, slightly more 
globose, and in having its umbilicus 
only partly covered. The chief point of 
difference lies in the prominent tooth-like 
process on the inner lip. The shell is 
yellowish horn color; whorls five, finely striated with — 
lines of growth; aperture bordered by a broad white lip; 
inner lip furnished with a white tooth; umbilicus only 
partly closed; diameter three-fourths of an inch. Dr. : 
Gould says that, though by no means common, this shell 
occurs in nearly all parts of Massachusetts. It must be — 
considered a rare shell in New England, though it is a 
very common species in New York, the Western ioi some 
of the Southern States. 
Herx Savu Binney. (Figs. 4, 5). This patai was 
4. 5. named by Dr. Amos Binney, in honor of 
: Thomas Say. The shell is depressed and 
thin ; color shining russet; whorls five, 
or six; aperture rounded, bordered by & 
narrow white lip, with a slight project- 
ing tooth near the uinbilieds:: There is 
also a prominent white tooth on the in- 
ner lip; umbilicus open, allowing all the 
volutions to be seen; diameter nearly 
= one inch. The animal is light reddish 
the aor ai Pret This species, though 
ighout F tis northern portion of 
