AF 
Og 
890 Binney’s Monograph of the Helices 
at a point very remote from the first, was described 
by him as Poryeyra fatigiata. Recently, Mr. Lea 
has enlarged its synonomy by the addition of two 
new specific names. The distinctions on which the 
latter has founded his species, in this instance, are 
not, I think, sufficient for that purpose ; if admitted 
to be valid, they would lead to an infinite multipli- 
cation of .species, and burthen the descriptive part of 
Natural History with a mass of matter beyond, the 
compass of any mind. 
Having in my possession original specimens of 
Potyeyra plicàta labelled by Mr. Say, and having 
" through the politeness of Mr. Lea had the opportu- 
nity. of examining the specimens from which he 
made his descriptions of Poryevna Dorfeuillàna and 
Troostiàòna, the opinion which I derived from his 
descriptions and figures has been confirmed, and I 
cannot doubt the specific identity of the three. 
There is, however, much difficulty in identifying 
specimens of Mr. Say's Potyeyre ; they vary much 
in size at maturity, and the younger shells differ from 
the older in a remarkable manner in the character of 
the aperture. There is a small shell figured by 
Férussae, Hist. Nat. des Moll., pl x, fig. 1, 89 
Porxevna pástula, Say. Its general characters agree 
with the species under consideration, but the aper 
ture is kidney-shaped, the lip reflected, ` thickened 
internally, and. divided by a deep cleft or sinus. It 
is distinctly umbilicated, and the lip extends to the 
edge of the umbilicus. The duplicature . of the colu- 
mella terminates in an acute angle, and is connected 
with either termination of the lip. 'T'he only recent 
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