1905.] “  - NATURAL SCIENCES OF PHILADELPHIA. 263 
Alt. 10.4 10 mm. 
Diam. 19 feen ya 
Alt. apert. 9.5 kt my 
Diam. apert. 10.4 Le oe 
Umbilicus 25 SY ia 
They are from ‘Spring Canyon,” near Fort Huachuca, No. 83,257, 
aN. S. P. 
The sole is indistinctly tripartite, the middle field ochraceous, the 
sides dusky; the colors separated by very faint lines. The upper 
surface is blackish-gray, evenly pebble-granose. A subobsolete dor- 
sal line is discernible, and a very weak line on the tail, not quite 
median. 
The two co-types were dissected. The genitalia (Pl. XX, figs. 16, 
17, 18) are characteristic by the proportions of the penis and vagina. 
The penis is short, cylindric, composed of a thin-walled sack containing 
a large, fleshy, cylindric papilla (fig. 18). Epiphallus and flagellum 
(fig. 16) as usual. The vagina is large, very long and muscular, about 
three times the length of the penis. Its upper portion is swollen and 
sometimes fusiform. Other organs as usual (see table of measure- 
ments). 
The jaw (Pl. XXIII, fig. 23) has four very wide, low, flat ribs. 
The radula has 36.1.36 teeth. the central and inner laterals unicuspid, 
the eleventh showing a minute ectocone. Most of the marginal teeth 
have both cusps bifid. 
2. Brown’s Canyon. One specimen similar to those from Cave 
Creek, Ida and Bear Canvons, 11.8 x 19 mm. 
3. Ramsey Canyon. ‘The shells are darker than the types, beauti- 
fully granulated, and show distinct spiral lines on the top of the last 
whorl. Umbilicus typical. 
4. Carr Canyon (Pl. XVIII, figs. 51-54). These shells show the 
spiral lincs more or less distinctly. They are otherwise typical, but 
vary a good deal in size. 
5. Miller Canyon (Pl. XVIII, figs. 41, 42,48). Of arich dark reddish 
color with a wide darker band, well granulated and showing weak or 
excessively faint spirals. More depressed than any other granulatissi- 
ma seen; and in some specimens the umbilicus is decidedly wider, 3 
mm. in a shell 18.5 mm. diameter. 
There were also some much lighter, greenish-yellow shells taken in 
Miller Canyon (Pl. XVIII, figs. 39, 40, 44). They are much depressed, 
with a wide umbilicus and very distinct spiral striation (Pl. XI, fig. 
10). They photograph abnormally dark. 
