286 The Auicrican Geologist. 
November, 1902 
H. altcniata and H. pcrspcctiva are now placed in the genus 
Pyramidnla, H. concava in the genus Circiiiaria and the re- 
maining species of Helix in the genus Polygyra, H. fraterna 
being a variety of P. inonodon. The "Achatina" is probably 
BuUmiiUis, and not from the loess. At least it has not been 
found in the loess along the Mississippi, though it is a char- 
acteristic species of the southern modern terrestrial molluscaii 
fauna, and its occurence as a fossil would not be surprising. 
W. G. Binney frequently refers to loess or "post-pliocene" 
fossils in his works on modern terrestrial molluscs, and many 
of them are unquestionably from the bluffs of the lower 
Mississippi. — some of them being specifically reported from 
Natchez. In 1865* he reported two species of terrestrial 
molluscs from the "post-pliocene of the Mississippi valley" 
(for the most part undoubtedly loess), one of them being a 
southern species which is known from the Xatchez loess. In 
1869"^ he reported 19 terrestrial species from the same in- 
definite source. Of these 15 species were found by the present 
author at Xatchez. They are .the following : 
Hyaliiia (now Gastrodonta) ligcra 
Macrocyclis (now Circiiiaria) concava 
Helix (now Pyraiiiidiila) altcniata 
pcrspcctiva 
• Strobila (now Strobilops) labyrinthica 
Helix (now Polygyra) stcnotrcma 
" hirsiita 
monodon 
palliata 
inflecta 
albolabris 
elcz'ata 
exoleta 
" " " profunda 
Succinea obliqua (now ovalis Say) 
Of the remaining four species one. Helix (now 
Pxraniidiila) solitaria does not belong to the southern fauna. $ 
The remaining three species. Helix (now Polygyra) thy- 
roid es, H. clausa, and Helix (now Gastrodonta) giilaris. are 
♦Smith. Miscell. Coll., no. 144, Sep., 1865. 
> In Binney and Bland.— Land and F. W. Shells of N. Am.— Smith. 
Miscell. Coll., p". 194: Feb., 18G9. 
tThe writer has reason to believe, from private correspondence with 
Mr.' Binney, that the shells reported under this name are Pvramidula 
strif^osa iuensif, a species bclon<iing to the northern loess. 
