272 PROCEEDINGS OF THE ACADEMY OF [Mch., 
in most colonies there is great individual variation in the extent to 
which it has been replaced in the adult stage by a rounded periphery. 
Oreohelix strigosa (Gld.). 
Various forms referable to strigosa occur in New Mexico, such as those 
sent from the Red river (Ashmun), Pecos (Cockerell), Canyon Diablo, 
near Rowe (Miss Cooper), and Big Spring, 5 miles east of Zufi (H. S. 
Conard). They are two-banded, with the periphery of the last whorl 
rounded, not differing from the forms commonly found farther north, 
but slightly unlike the typical Northwestern strigosa. The exact affini- 
ties of these forms await further investigations now in progress, 
I have examined the internal anatomy of specimens from Pecos, 
New Mexico. The shells are cither rounded or subangular at the 
periphery in adults. Sculpture of sharp, irregular growth-wrinkles 
or striae, decussatecd by slightly impressed spiral lines both above 
and below. The color varies from yellowish Isabelline to light 
reddish, with paler strie, always with two narrow bands, and in one 
specimen a third band around the umbilicus. The embryonic 
shell is strongly carinate. The first whorl is convex and almost smooth; 
then fine, regular, obliquely radial strize appear, and continue to the 
end of the embryonic shell of 2 to 24 whorls; over them there is an 
extremely minute regular spiral striation, and on the last half, whorl 
coarser, spaced spirals (Pl. XXV, figs. 45, 46, 47). 
The specimens examined were taken August 9, 1903. The penis is 
very long and strongly twisted. The basal third of its length is cylin- 
dric, the rest more or less lank, partially collapsed. Internally the 
basal third (5 mm.) is rather finely plicate longitudinally, thick-walled ; 
the rest has larger lumen and thinner walls, which are densely papillose 
within, the distal half having three low fleshy internal ridges. The 
penial retractor is inserted upon the end of the penis and the base of 
the epiphallus, which is decidedly less than onc-half the length of the 
penis. The vagina is subcylindric. The uterus is distended with 
embryos, of which there are 9, with shells 3 to 4 mm. in diameter (PI. 
XI, figs. 14, 15). Each is enclosed in a membranous capsule, ap- 
parently the podocyst. Some of them seem to have a small cephalic 
vesicle. The other 2 organs call for no especial notice (Pl. XIX, fig. 3). 
The pallial organs have been described above. The kidney is 6.7, 
the pericardium 4.6 mm. long. 
The foot is slate-blackish and finely granular above, the dorsal fur- 
rows distinct. The distinct genital furrow is duplicated on the left 
side. 
The jaw (Pl. XXIII, fig. 25) has fine vertical strie. 
