212 LAND AND FRESH-WATER SHELLS OF N. A. [PART IV. 



olive-green. Even the little M. siliqua may be only a starved speci- 

 men of the Nisqually variety. All have a varix half a volution from 

 the mouth." 



Fig. 422, Lake George specimen. 



98. G. silicula, Gould. 



Melania silicula Gould, Bost. Proc, ii, p. 224, June, 1S47. Otia Conchologica, p. 



46. Moll. Expl. Exped., p. Ill, f. 164. 164a. Coopek, Report, p. 374. Binxey, 



Check List, No. 243. Brot, List, p. 52. 

 Juga silicula, Gould, Adams, Genera, i, p. 304. 

 Melania Shastaensis, Lea, Proc. Acad. Nat. Sci., viii, p. 80, April, 1856. BiNNKT, 



Check List, No. 212. Cooper. Report, p. 374. 

 Goniobasis Shastaensis, Lea, Jour. Acad. Nat. Sci., v, pt. 3, p. 337, t. 38, f. 199, 



March, 1863. Obs., ix, p, 159. 

 Melania rudens, Reeve, Monog. Melania, sp. 224, May, 1860. Brot, List, p. 



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



■with a somewhat clouded, dark chestnut epidermis. There are about 



four, entire whorls, several others being lost from the tip ; they are 



^. well rounded, and marked with numerous, fine, revolving 



Fig. 423. ' ' o 



threads, and all but the two largest ones are longitudinally 

 plaited. The aperture is small, rounded-ovate, scarcely pro- 

 duced in front, and about one-fourth the length of the shell. 

 The throat has a pale violet tint. The last whorl has a dark, 

 narrow band around it, just at the junction of the lip of it. 

 Length, one-half; breadth, one-fifth of an inch. 

 Habitat. — Nisqually, Oregon. 



Observations. — It resembles M. proxima, Say, which is less cylin- 

 drical and without folds. — Gould. 



Melania silicula. — Shell small, graceful, subcylindrical, truncated; 

 epidermis chestnut-brown ; spire of four remaining whorls, rounded, 

 spirally Urate, the upper longitudinally plicate ; the last whorl banded 

 with brown ; sutures well impressed ; aperture roundly ovate, scarcely 

 produced in front ; pale violaceous. 

 Longitude one-half; latitude, one-fifth poll. 

 Habitat. — Nisqually, Oregon. — Gould. 



This species differs much from pUcifera in being more nar- 

 rowly cylindrical, the whorls, generally, but not always, more 

 convex, and especially in the broad band. It is a beautiful 

 and numerous species, extending to all parts of Oregon and 

 California. Dr. Gould's descnption refers to a young shell, 

 of which G. SJiastaensis, Lea is the adult. Melania rudens of 



