1905.] NATURAL SCIENCES OF PHILADELPHIA, 263 



They arc from "Spring Canyon/' near Fort Huachiica, No. 83,257, 

 A. N. S. P. 



The sole is indistinctly tripartite, the middle field ochraccous, 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 c[uite 

 median. 



The two co-types were dissected. The genitalia (PI. 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, i^ery long and muscular, about 

 three times the length of the penis. Its upper portion is s^^•ollen and 

 sometimes fusiform. Other organs as usual (see table of measure- 

 ments). 



The jaw (PI. 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 Canyons, 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 XVHI, figs. 51-54). These shells show the 

 spiral lines more or less distinctly. They are otherwise typical, but 

 vary a good deal in size. 



5. Miller Canyon (PL XVIII, figs. 41 , 42, 43) . Of a rich 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 arc much depressed, 

 with a wide umbilicus and very distinct spiral striation (PL XI, fig. 

 10). They photograph abnormally dark. 



