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 by the valley of the San Pedro River. It seems very closely related to S. caerulifluminis except in form of the verge, which is stouter.

20 living specimens from Station 30, all taken, measure as follows:

Diameters in mm 25 25.5 26 26.5 27 27.5 28 29 No. specimens 1 1 2 2 3 2 8 1

17 specimens from Station 24, a southern slope:

Diameters 24 24.5 25 26 26.5 27 28 28.5 30.5 No. specimens 1 2 3 2 4 1 2 1 1

S. galiurensis was taken on Picket Post Mountain, southwest of Superior, Pinal County, the shells from 24.7 to 28 mm. diameter, with the embryonic whorls differing slightly, increasing a little more rapidly; umbilicus contained 7-2/3 times in the diameter. The penis has a sheath of loose strands only, near the base. The verge has strong circular corrugations near the end. Length of penis 8, verge 4, epiphallus 6, vagina 10 mm. (Fig. 170 c, c).

One specimen from " Nantes Mts. 10 miles north of Rice ", Gila County, has a narrow umbilicus, contained 10 times in the diameter, as in S. g. superioris, but the proportions of the genitalia (Fig. 170 a, a) are as in S. galiurensis except that the flagellum is very short. Length of penis 8, verge 4, epiphallus 6.5, flagellum 0.3, vagina 10 mm.

A specimen was taken by Dr. Ci. H. Horn at or near old Fort Grant, at the western base of the Graham (Pinaleno) Mountains, Graham County, about 1864, and recorded as " H. strigosa Gld." by W. M. Gabb (Amer. Journ. Conch., 2: 330, 1866).

Soncrella galiurensis superioris new subspecies Fig. i7i d, e.

The shell differs from S. galiurensis by its narrower umbilicus, contained 8-1/2 to 12 times in the diameter; embryonic whorls similar, being profusely wrinkle-granulose following smooth and radially rippled stages, with irregular, forwardly descending threads on the peripheral half.

Height 16.2 mm., diameter 25.8 mm.; 4-2/3 whorls.

Paratypes measure 14.6 x 24 mm. and 16.6 x 27.8 mm.

The genitalia (Fig. 170 B, b) are characterized by the greater length of the penis compared with that of galiurensis, about 60 percent of the diameter of the shell; it has a strong sheath around the slender anterior third. The base of epiphallus is enlarged by union with the penial retractor for a distance of about 1 mm. The verge is transversely wrinkled. Flagellum well developed. Length of penis 16. verge 7, epiphallus 7, vagina 8 mm.

Arizona: Near the highway tunnel 4 miles east of Superior, Pinal County (J. H. Ferriss), Type 166682 A.N.S.P. Also in the same county at Ray (from G. H. Clapp), and at Kelvin (Barber).

As in S. galiurensis, the degree of depression of the spire varies. The smallest shell seen has a diameter of 21.6 mm. At Kelvin, 271012 U.S.N.M., the diameter is from 24 to 24.7 mm.

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