NEW YORWA 
BOTANICAL GARDEN, 
1890. | WALTON—ON MESODON SAYII. IOI 
OCTOBER 13, 1890. 
STATED MEETING. 
The President, Pror. H. L. FatrcuiLp, in the chair. 
Fifteen persons present. 
The Council report recommended the payment of certain bills, 
which were voted. 
Rev. JOHN WALTON presented the following 
NOTE ON THE OCCURRENCE OF MESODON SAYILI: 
In July of 1890, at the Natural Science Camp on Canandaigua 
Lake, while conducting a class of young men in their search for Helices, 
I found two specimens of a very rare shell, namely Aesodon Sayit, 
Binn. I had not met with this species before, and in corresponding 
with my conchological friends in this locality in regard to it I learned 
they had never found it, nor had any of them a specimen of it in their 
cabinets. 
This Helix was named aodonta by Mr. Say in 1824, and in 1840 
this specific name was changed to that of Sayze by Mr. Binney, who 
describes it — 
“Shell umbilicated, orbicularly depressed, thin, epidermis light 
“russet, shining; whorls between five and six, with numerous fine 
“oblique strize; suture impressed, aperture lunately subcircular, not 
Fig. 1. Fig. 2. 
MEsopon Savill. 
“ dilated, peristome white, narrow, thickened, reflected, with a slightly 
“projecting tooth on the inner edge of the basal portion near the um- 
“)bilicus; parietal wall with a sub-prominant, white tooth, umbilicus 
“open, deep, not wide, exhibiting all the volutions, slightly contracted 
“by the reflected peristome; base rounded, with striae distinct, con- 
“verging into the umbilicus. Shell about one inch wide.” 
‘Animal light reddish brown, eye peduncles and tentacles smoky, 
“eyes black, head and neck cylindrical, foot narrow, terminating in an 
“acute point; length about twice the diameter of the shell.” 
8, Proc. Rocu. Acapb. oF Sci., VOL. 1, JULY, 1891. 
