128 THE NAUTILUS. 
surface very slightly striated, shining ; whorls six, gradually increasing, 
with the suture rather deep between the upper, less so between the 
lower whorls; the last whorl moderately ascending at the aperture, 
rather rounded at the base, slightly expanded near the aperture, with 
an impression over the inferior palatal fold; aperture rather oval, 
truncated above, margins well everted, the palatal somewhat more 
curved than the columellar, the two connected by a thin callus; 
lamellae and folds four, subequal; angulo-parietal appearing almost 
simple, inclined toward the columella; columellar horizontal, rather 
short and strong, palatals rather short and stout, in normal position, 
the inferior somewhat larger and more remote from the margin ; size: 
alt. 2.4 to 2.8, diam. 13; apert. alt. 1.0 mm. 
Hab.: Capitan Mts., Lincoln Co., New Mexico. Over a hundred 
good, fresh specimens were collected by Rev. E. H. Ashmun. 
In size, shape and color, our species has much resemblance to 
Bif. contracta Say, but the aperture, with its lamella and folds, is 
very different, as is at once apparent from the description. Bif. 
quadridentata rather ranges with Bif. pilsbryana, which, however 
is very much smaller, usually has a basal lamella and whose angulo- 
parietal shows hardly its being complex. 
Bir. HORDEACELLA Pils. var. PARVIDENS, n. Quite small, apex more 
acute than in typical examples, and outline more obovoid ; peristome 
rather abruptly but narrowy everted; lamellz and folds small, es. 
pecially so the upper palatal, often being a mere trace; basal absent 
or very small; color pale horn; alt. 1.5 to2 mm. Jerome, Arizona, 
a good number of specimens, collected by Rev. EK. H. Ashmum, 
Pupa (PuPILLA) SONORANA, n. sp. Shell perforate-rimate, cylin- 
drical, apex obtuse, rounded; color brownish horn; surface finely 
striated-rugulose, more coarsely so near the aperture ; whorls 63, grad- 
ually increasing; suture rather deep; the iast whorl comparatively 
small, compressed in its inferior part, the base narrow, almost keeled ; 
near the aperture a high, sharp bulging filled with a strong whitish 
callus, shining through the shell ; a narrow, deep constriction in front 
of it, and an impression over the palatal fold; aperture rather small ; 
margins abruptly but rather narrowly everted; lameilze and folds 3, 
white; parietal rather deep seated, long, spiral; columellar perpen- 
dicular (along the columella), lamellar; palatal (the inferior) rather 
strovg, often with a thread-like prolongation inward. Size: alt. 2.0, 
diam. 1.3. ; 
