THE NAUTILUS. 103 
seen with a good lens, though it was not noticed by Say, who probably 
worked with what would now be thought an inferior glass. In cen- 
tral and southern Texas a large race occurs, in which the shell attains 
a diameter of 6mm. Itis always distinctly perforate, pale and pellucid. 
The difference between this and the form from other regions is slight. 
but seems correllated with geographic position. Some hundreds of 
specimens have been examined, from New Braunfels, Hidalgo, San 
Antonio, etc. I have seen this form labelled “ Z. scu/ptilis’’ by 
some collectors, and Mr. Binney so identified the specimens collected 
in Texas by Hemphill, some of which are before me. (Man. Amer. 
L. Sh. p. 219). It is quite unlike true sew/ptilis, but approaches Vit- 
rea carolinensis Ckll., which is a geographically separated mountain 
form, very close to /ndentata, though, I believe, sufficiently distinguish- 
able. 
SUCCINEA RETUSA MAGISTER n. var. Distinguished from WS. re- 
tusa Lea (ovalis Gld. not Say) by its larger size, less developed spire 
and larger aperture. Alt. 18, greatest width 93-10, length of aperture 
15-14 mim. 
A commen form in the northern Mississippi valley, sufficiently un- 
like “ ovalis”’ to be separated therefrom by collectors generally, and 
frequently called “ S. Miggins’.”” It is No. 358a, of the catalogue. 
Types are from Rock Island, Illinois, collected by myself. 
PUPA DECORA AND ITS ALLIES.—An excellent series of the typical 
Pupa decora having been secured by Mr. P. B. Randolph in the 
Dyea Valley, it is possible to institute more satisfactory comparisons 
with allied forms than the limited number of specimens before avati- 
able permitted P. decora seems to vary but little. Of its imme. 
diate allies P. corpulenta Morse is very uear decora, perhaps only 
varietally distinct. J. comcinnula, Ckll. is a smaller shell, with 
elongated laminz rather than denticles within the outer lip. It oe- 
curs in Colorado, and I have received specimens from the Jemez 
Mountains, New Mexico, collected by Rev. E. H. Ashmun.  P. co- 
lumbiana Sterki is an apparently valid species of this group, though 
not yet described; and I have still another form from near Lake Su- 
perior which is allied tu P. decora, but differs in smaller size, in hay- 
ing another denticle at the foot of the columella (five in all, instead of 
four), and a sharper, higher crest behind the outer lip, the edge of the 
latter more projecting in a point above, when seen in a profile view. 
This may be called Pupa (Nearctu/a) superioris. The west coast 
