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 arc as in Pecos strigosa. The 9 

 organs show nothing noteworthy. 



The radiila (PI. 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 begms weakly on the sixth 

 or seventh, and is well developed on the eleventh tooth. The marginal 

 teeth are all Vjicuspid, the cusps unsplit. 



0. s. huachucana is widely distributed in the canyons of the Huachuca 

 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 (PI. 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 (PI. XXIV, figs. 11, 12, 16). 



4. Dull brown predominates throughout. Usually there are no 

 bands (PI. XXIV, figs. 13, 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 (PI. XXIV, fig. 15). 



5. A broad, blackish-chestnut ])and below the periphery, the rest 



