412 PROCEEDINGS OF THE ACADEMY OF [1889. 



Pupa sterkiana Pilsbry. PI. 2, figs. 2, 3. 



Shell rimate, perforate when young, cylindrical, blunt at both 

 ends, opaque, chestnut-brown ; surface obliquely sculptured with 

 strong, rather irregular costula?, which often split or branch ; 

 suture very deeply impressed; whorls 7, the first one smooth, the 

 last five of about equal diameter, very convex ; last whorl a little 

 ascending to the aperture, without crest or scrobiculation behind 

 the peristome ; aperture a trifle oblique, rounded, truncate above ; 

 lip expanded, continuous, thin, white, without teeth or folds ; um- 

 bilicus deeply impressed, appearing very narrowly perforated. 



Alt. 4], diam. 1J mill. 



Alt. 4, diam. H mill. 



i 



Specimens of this species are in the Academy from Lower Cali- 

 fornia. They were received from Mr. C. R. Orcutt of San Diego, 

 Cal. The large size (much exceeding any other West American 

 Papa) toothless lip and strongly costate surface will at once dis- 

 tinguish it. The peristome is continuous as a slightly elevated lamina 

 across the parietal wall. The columella has a very obtuse, blunt, 

 deep-seated fold. 



Zonites simpsoni Pilsbry. PI. 12, figs. 8, 9, 10. 



This species belongs to that group of Hyalina comprising capsella 

 Gld.j lawi W. G. Binn., and placentula Shutt., — species with narrow 

 umbilicus, numerous closely coiled narrow whorls, and without 

 a callus or thickening within the base of the last whorl. Z. simp- 

 soni differs from placentula in its much smaller size, nearly straight, 

 instead of arcuate basal lip, seen from beneath, proportionately 

 wider last whorl, and the more trigonal, wider aperture. With 

 Z. lawi I need not compare, as that species is much larger and more 

 elevated. Z. capsella is about the same size, color and texture as 

 simpsoni, but has a narrow umbilicus and very much narrower 

 aperture, narrowly semilunar instead of trigonal in outline. Z. simp- 

 soni has 5 whorls. Alt. 2, diam. maj. 4 J, min. 4 mill. 



The specimens before me were collected by Mr. C. T. Simpson at 

 Limestone Gap, Indian Territory. The trigonal form of the aper- 

 ture is so peculiar that the species may be separated from Z. capsella 

 at a glance. My comparisons were made with specimens of capsella 

 received from Gould, and placentula from W. G. Binney. The fig- 

 ures are camera lucida drawings. 



