386 ^ Binney's Monograph of the Helices 
dented below ; pillar-lip emarginate, strongly re- 
flected and pressed upwards into the aperture in an 
acute angle; aperture ear-shaped, throat very nar- 
row, with a lamellar fold or tooth within above, and 
another more external below, with a deep suleus 
between them; umbilicus open, carinated and 
grooved on the last whorl, exhibiting nearly two 
volutions. 
Greatest transverse diameter more th half an 
inch. 
GEOGRAPHICAL DISTRIBUTION. ' dhiii Georgia 
and Florida, common near St. Augustine and at 
various places on St. John’s River. 
Remarks. This is one of several curious species, 
which were discovered by Mr. Say in Florida, and 
of which he formed the genus Poryeyra, so called 
from the numerous whorls of some of them. "The 
animal does not appear to differ from that of Herr; 
and, as mere peculiarities in the shell are not recog- 
nised as sufficient for the subdivision of genera, his 
distinction has not obtained. Mr. Say gives a sep- 
arate measurement of males and females, from which 
it would seem that: he considered the animals to be 
unisexual, a distinction which, if correct, would . 
effectually separate it from Hetix, the animal of 
which, in every ¢ase, combines both sexes, in the 
sarne individual. I have had occasion to notice con- 
siderable numbers 'of the animal of Poryevna septem- 
vólva, Sav, but have not observed any fact which 
would tend to confirm such an opinion. On the 
contrary, it has appeared to me, that they were 
analogous in all respects to the animals of the genus 
ELIX. R on ! 
