196 PALAEONTOLOGY. 



the exposure of another above the suture that is usually hidden beneath it 

 by each succeeding turn. 



Among the existing American species, this seems to be most nearly 

 represented by G. Alhamjensis, Lea. Mr. Tryon, to whom I sent a specimen 

 of it, thinks it resembles some Asiatic species of Melania, and that it may 

 possibly belong to that genus, and not to Goniohasis. 



Since publishing a description of this shell under the name Melania 

 {Goniohasis f) sculptilis, I have been led to suspect that it may not be distinct 

 from Melania Taylori of Gabb, described in the California Report from the 

 same region. Mr. Gabb's type seems to be much more slender and 

 elongated, however, especially if his restored outline of the wanting part of 

 its spire is nearly correctly drawn. Still, our types may be only young 

 specimens of the same, as they are much smaller. I remember that there 

 were with them a few larger casts and imperfect specimens from the same 

 locality, so coated over with a calcareous deposit that their characters could 

 not be made out. These agree more nearly in size and form with Mr. 

 Gabb's type. 



Locality and position. — Kaw-soh Mountains, Nevada; Tertiary. 



Melania T subsculptilis, Meek. 



Plato 17, fig. 9. 

 Melania {Ooniobasis ?) subsculptilis, Meek (1870), Proceed. Acad. Nat. Sci. Philad., 58. 



Shell apparently less than a medium size ; spire conical, with convex 

 slopes ; apex pointed, not eroded ; volutions about seven and a half, flat- 

 tened-convex ; suture channeled ; aperture ovate, slightly oblique, rather 

 abruptly rounded below ; margin of lip most prominent below the middle, 

 and faintly sinuous on the lower inner side. Suriiice ornamented by small, 

 regular, shghtly sigmoid, vertical costa?, with an obscure revolving ridge 

 just below, and a slight angle above the suture, to which prominences the 

 costae impart a somewhat crenated appearance ; last turn marked with a few 

 distinct, revolving, raised lines, strongest on the lower half. 



Length, 0.43 inch; breadth, 0.19 inch; length of aperture, 0.14 inch; 

 breadth of same, 0.10 inch. 



This form differs from the last by its smaller and more crowded costa;, 



