276 PROCEEDINGS OF THE ACADEMY OF [Mch., 
fig. 6). It was taken in February, during the inactive season, and the 
uterus is quite small. The dimensions of the organs are given in the 
table (p. 270). The lower half of the penis is much swollen, the upper 
half smaller and lank. When opened the basal narrower portion is 
found to have strong acute folds; these become weak in the swollen 
part, which contains a large fleshy process adnate to the upper side. 
The contracted upper portion of the penis is papillose inside, with three 
low ridges. 
The retractor muscle and epiphallus are as in Pecos strigosa. The 2 
organs show nothing noteworthy. 
The radula (Pl. XXII, fig. 5, group of transitional teeth) has 30.1.30 
teeth. Those of the median area are much as in Pecos strigosa, with 
overhanging mesocones only. The ectocone beg:ns weakly on the sixth 
or seventh, and is well developed on the eleventh tooth. The marginal 
teeth are all bicuspid, the cusps unsplit. 
O. s. huachucana is widely distributed in the canyons of the Huachueh 
Mountains, and nearly every colony has some individual features. 
“Sometimes only one form was found in a colony, but usually they 
vary in color and form. They are slow travelers and hence the dis- 
tinctive characteristics of the colonies. They had not encroached at 
all upon the ground burned over two years ago. Colonies on different 
sides of the divides between canyons were entirely different, even when 
but a hundred or two hundred feet apart’’ (Ferriss). 
Brown Canyon, Huachuca Mountains. Numerous colonies in this 
canyon vary in color, but in all the periphery of the last whorl may 
either be rounded, as in the type lot, or the acute keel of the young may 
extend upon the first third or half. The color-forms of the individual 
colonies are as follows: 
2. Solid, opaque pinkish-white, with a few fleshy streaks and scattered 
dots. Sculpture weak (Pl. XXIV, figs. 9, 10). 
3. Similar, but with a narrow band on the upper surface and on the 
base a band below the periphery, as in the typical form. Frequently 
the upper surface is largely fleshy-brown. This is an abundant form, 
differing from the Conservatory Canyon race only in the frequent 
retention of the keel in adults (Pl. XXIV, figs. 11, 12, 16). 
4. Dull brown predominates throughout. Usually there are no 
bands (Pl. XXIV, figs. 18,14). This and all the preceding from Brown 
Canyon are from about 7,000 feet. Some specimens are like the 
following form. In one gerontic colony at 6,000 feet the peristome is 
contracted and continuous in old shells (Pl. XXIV, fig. 15). 
5. A broad, blackish-chestnut band below the periphery, the rest 
