240 AMERICAN JOURNAL 



4. GoNioBASis siLicuLA, Gould. — t. 24, f. 8, 9. 



G. Shastaensis, Lea. 



Description. — "A small, slender, nearly cylindrical species, 

 covered with a somewhat clouded dark chesnut epidermis. 

 There are about four entire whorls, several others being lost 

 from the tips ; they are well rounded, and marked with nume- 

 rous fine, revolving threads, and all but the two largest ones 

 are longitudinally plaited. The aperture is small, rounded- 

 ovate, scarcely produced in front, and about one-fourth the 

 length of the shell. The throat has a pale violet tint. The 

 last whorl has a dark and narrow band around it, just at the 

 junction of the lip to it. 



Dimensions. — Length | inch, breadth 1-5 inch. 



Habitat. — Found at Nisqually, Oregon. 



It resembles M. proxima, Say, which is less cylindrical, and 

 without folds." 



Melania silicula, Grould. — Fig. 8. 



The following is Mr. Lea's description : 



'"'Melania Shastaensis, Lea. — Fig. 9. 



Description. — "Shell striate, subcylindrical, rather thin, dark 

 horn-color, banded; spire elevated, folded at the apex; suture 

 very much impressed ; whorls convex ; aperture small, ovate, 

 white within ; columella smooth, incurved and recurved. 



Operculum ovate, the polar point being near the left side 

 and below the middle. 



Salitat. — Shasta and Scott Eivers, California, Dr. Trask; 

 and Fort Umpqua, 0. T., Smithsonian Institution. 



Dimensions. — Diam. •34 inch, length 1'05 inch. 



Remarks. — Nearly thirty specimens of this species were 

 kindly sent to me by Dr. Trask. The form and size of this 

 species is very much the same as Melania {Goniohasis) Virgin- 

 ica, Say. It differs in the form of the aperture, in having but 

 a single revolving wide band, and in being more cylindrical. 

 The jShastaensis varies like the Virginica, in being very uncer- 

 tain as to striation. Some of the specimens are covered with 

 minute revolving striae, while others are almost entirely desti- 

 tute of them. In every specimen before me, there is a broad 

 revolving brown band on the middle of the whorls, more or 

 less distinct, and always with more intense color on the supe- 

 rior whorls. This band often becomes obsolete on the inferior 

 whorls, but when that is not the case, it may be seen within 

 the aperture also. A few of the specimens have the columella 



