1889.] NATURAL SCIENCES OF PHILADELPHIA. 413 



Zonites selenitoides Pilsbry. PL 12, figs. 13, 14, 15. 



This species is similar in form and general appearance to Z. minus- 

 en his Binn., though decidedly larger. The umbilicus is broad, as 

 in the latter species. The shell is thin, light yellowish-horn eolor, 

 almost white. Surface shining, covered with close strong oblique 

 rib-stria?, like Patula striatella ; these stria? while generally regular, 

 sometimes bifurcate, or separate to give room for another to be in- 

 tercalated. The spire is flatter than minuscuhis, nearly plane. The 

 earlier If to 2 whorls are smooth, polished, not striate; the sutures 

 are well impressed. There are 3? whorls in all, convex, gradually 

 widening, the last proportionately wider than in Z. minuscuhis. 

 Aperture slightly oblique, lunate, narrower than in Z. minuscuhis, 

 its margins thin, acute, scarcely converging, the columellar shortly 

 subreflexed. 



Alt. 1*2 mill. , diam. 3 mill. 



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 Selenites duranti of Southern Cali- 

 fornia. 



Helix ( Hemitrochus ) streatori Pilsbry. PI. 12. fig. 1. 



Shell imperforate, depressed, thin but rather strong, resembling 

 in contour Hemitrochus amplecta Gundlach of Cuba. It is white, 

 with dark purplish-brown apex and a narrow, well-defined supra- 

 peripheral band of the same color. Above this band there are two 

 lighter, interrupted subobsolete bands (sometimes confluent into 

 one) ; on the base there is a zone composed of several interrupted 

 lines or narrow bands, close together or confluent, broken into 

 blotches, fading into the ground-color on the edges, with a tendency 

 to form short streaks in the direction of the growth lines. Surface 

 shining, finely obliquely striate, except the smooth 1? apical whorls. 

 The spire is low-conoidal ; apex blunt ; sutures evenly, moderately 

 impressed ; whorls 4J, slightly convex, the last depressed, deflexed 

 toward the aperture. Aperture very oblique, transversely oval, 

 obliquely truncated by the parietal wall, distinctly showing a band 

 within ; peristome thickened inside, upper margin simple, outer a 

 little expanded, basal narrowly reflexed, brown, appressed over and 

 closing the narrow axial perforation. 



Alt. 7, greater diam. 12, lesser diam. 10 mill. 



