218 BULLETIN OF THE 



SINCE the foregoing was written, the following species have been de- 

 scribed : 



Zonites selenitoid.es, PILSBRT. 



This species is similar in form and general appearance to Z. minitsculus, Binii., 

 though decidedly larger. The umbilicus is broad, as in the latter species. The 

 shell is thin, light yellowish horn-color, almost white. Surface 

 shining, covered with close strong oblique rib-stria?, like Putuln 

 striatella; these striae, while generally regular, sometimes bifurcate, 

 or separate to give room for another to be inter- 

 calated. The spire is flatter than minitsculus, nearly 

 plane. The earlier If to 2 whorls are smooth, pol- 

 ished, not striate ; the sutures are well impressed. 



There are 3i whorls in all, convex, gradually widen- 

 Zonites selenitoi- ... . . , . r, . Sculpturing, en- 



des, enlarged. S> the last proportionately wider thau in Z. minus- Iarged 



adus. Aperture slightly oblique, lunate, narrower 



than in Z. minusculus, its margins thin, acute, scarcely converging, the columellar 

 shortly subreflexed. 



Alt. 1.2 mm., diam. 3 mm. 



The specimens were presented to me by Mr. W. G. Binney, who, regarding them 

 as new, kindly permitted me to describe them. They were gathered by Hemphill, 

 prince of collectors ! at Mariposa Big Trees, California. The name selenitoides is 

 given because of a certain resemblance to the little Sclenites Duranti of Southern 

 California. 



The above description was published by Pilsbry in Proceedings of Academy 

 of Natural Sciences of Philadelphia, 1889, p. 413, Plate XII. Figs. 13-15. 

 I give a figure of the original specimen, and of its sculpturing. 



Zonites Simpsoni, PILSBRY. 



This species belongs to that group of ITi/aUna comprising capsella, Gld., Lau-ce, 

 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. Simpsoni 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. Lau-ce I need not 

 compare it, 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. Simpsoni has 5 whorls. Alt. 2, diam. maj. 4^, min. 4 mm. 



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

 Gap, Indian Territory. The trigonal form of the aperture 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 figures are camera lucida drawings. 



From Proc. Acad. Nat. Sci. Phila., 1889, p. 412, Plate XII. Figs. 8-10. 



