Page:Land Mollusca of North America (north of Mexico) Vol. I Part 1 277-end.pdf/133

Rh lot, 142330 A.N.S.P., from Station 241 cast of the crest of the range, a smaller form from Station 240, west of the crest (Pilsbry and Ferriss).

The granulation is very much reduced in this species. The upper and lower bands are as wide as the central one or wider, not reduced as they are in H. texana. The small form from Station 240 resembles H. texana

Fig. 273. Humboldtiana ultima, type, paratype, and sculpture of last and penult whorls.

rather closely, but it has a larger aperture and scarcely a trace of granulation. The species is very distinct from all others anatomically, standing much nearer to Mexican than to the other Texan species.

Genitalia (Fig. 274). The penis and epiphallus arc shorter than in H. buffoniana, the flagellum very much longer, about five times the length of penis and epiphallus. The dart sacs are inserted further up on the vagina, at about its middle. Mucous gland ring is very prominent and close above the summits of the dart sacs. The diverticulum arises nearer the spermatheca than in buffoniana, only about 10 mm from the distal end. The lengths of the organs arc as follows:

Penis 7 mm. Vagina and atrium 16 mm.

Epiphallus 11 mm. Spermatheca and duct 62 mm.

Flagellum 96 mm. Diverticulum 6 mm.