1923] NATURAL SCIENCES OF PHILADELPHIA 91 
Malpais slides in a small black hill 3 miles east of north of Bobb’s 
Butte, southern end of the Roskruge Range, Station 110. 
A specimen from near the Desert Laboratory, Tumamoc Hill, 
was dissected and the penis is drawn in Plate VII, fig. 14. It agrees 
well with the original lot, except that the spiral grooves of the 
penis-papilla are less closely wound. The penis and epiphallus 
are each 9 mm. long, papilla 4 mm., in a shell 8.5 x 15.7 mm. 
There is no flagellum. 
At Station 87 the specimens vary from 18 to 20.5 mm. diameter, 
becoming larger than any from the type locality. None have been 
dissected from the Tucson Range proper, west of Tumamoc Hill, 
or from the Silver Bell, but except in attaining larger size they 
appear to be identical. 
At Station 110, southern foothills of the Roskruge Range, the 
specimens are much like the smallest examples of typical S. tu- 
mamocensis, diam. 14 to 16.2 mm. They are more depressed than 
the larger Tucson Range shells, somewhat translucent. The 
animals had been dried, but by the use of potash one was soaked up. 
The genitalia (Plate VII, fig. 15) do not differ materially from twma- 
mocensis, except that the papilla appears to be smooth and shaped 
as in S. binneyi, not tapering and spirally grooved as in tuma- 
mocensis. ‘There is a very small flagellum. 
Length of penis 12 mm. Length of epiphallus 7.5 mm. 
sin © ‘papilla a eae S ‘“ vagina 8 
Little stress can be attached to such details in a specimen so 
poorly preserved. Evidently a further investigation of the anato- 
my of these several forms referred to tumamocensis must be made. 
The shells at station 110 show considerable variation in size of 
the umbilicus: 
Height 8, diam. 16.2, width umbilicus 2.5 mm. 
8 ‘a9 4D “ce ce Pil ce 
CO Wiel eet SN a a Ty 
Similar variation occurs in the type locality, where also most 
specimens are larger. 
These specimens from Station 110 are very much like S. ferrissi, 
but the last whorl is more depressed in the latter. 
HuacHucan SoONORELLAS.—The Huachucas have a more varied 
fauna of Sonorellas than any other range yet explored, the five 
species known anatomically belonging to four of the groups founded 
