330 



PROCEEDINGS OF THE ACADEMY OF 



[May, 



in great profusion at Station 5 on the east side of Daniels Mountain, 

 near the summit, with Holospira bilamellata . Also at Stations 7, 10 

 and 11, the latter at the summit of Hacheta Grande. 



The specimens from Station 5 (not far from the site of Dr. Mearns's 

 camp) agree well with the original specimens, description and figure. 

 Usually the parietal callus is raised from the surface as a thin, straight 

 lamina, and in almost all of them the edge is more definite than in 

 shells from other stations. The axial end of the parietal lamella 

 is abruptly bent towards the columella and is more or less tubercular; 

 Rarely the tubercle is almost free from the lamella. The spire is 

 occasionally almost fiat. The color in shells taken alive is translucent 

 sayal brown. The diameter varies from 11.5 to 14.5 mm. 



In specimens from the summit of Hacheta Grande the parietal 

 lamellffi are a little shorter; the axial end of the longer branch is 



often straight, but more fre- 

 quently is bent, or the bend is 

 represented by a tubercle con- 

 nected with, or almost free from 

 the lamella. The edge of the 

 parietal callus is appressed to the 

 surface, and is often arcuate. 

 The aperture varies in obliquity, 

 as the figures show. 



The penis is stout, bipartite. 

 The epiphallus is strongly con- 

 voluted just beyond the insertion 

 of the retractor muscle. It is 

 very long. No flagellum seen. 

 The spermatheca is largest in the 

 middle, thin-walled. Length of 

 penis 4.5 mm.; epiphallus 30 

 mm. ; vagina 4 mm. ; spermatheca and duct 19 mm. 



A. mearnsi lives in the earth under stones, like A. ivalkeri in the 

 Floridas, both being burrowing species. It is closely related to 

 A. kochi Clapp and A. walkeri Ferriss, but quite distinct from both. 

 A. levettei bifurca in the Huachucas is a less depressed shell with 

 more whorls. 



Oreohelix (Radiocentrum) hachetana n. up. Plate VI, figis. 1 to Id, 6. 



The shell is depressed, umbilicate, the umbilicus about one-fourth 

 the diameter of the shell ; moderately solid, but thin, opaque whitish, 

 obliquely streaked or smeared with various shades from light cinna- 



Fig. 3. — Genitalia of A. mearnsi. epi., 

 epiphallus; p., penis; r.p., retractor 

 of the penis; sp., spermatheca; ut., 

 uterus. 



