ZONITES. 113 



Genitalia (Vol. I. PL VII. Fig. I) with no accessory organs. The penis sac 

 is long, tapering towards the apex, where it receives the vas deferens and re- 

 tractor muscle. The genital bladder is elongate oval on a short duct. In this 

 figure the caudal mucus pore is not shown. The penis on the outside presents 

 a row of minute, round, glandular bodies. 



Zonites Whitneyi, Newcomb. 



Shell umbilicated, greatly depressed, thin, smooth, scarcely marked by the 

 delicate wrinkles, shining, smoky horn-color ; spire slightly elevated ; whorls 

 4, flattened, the last planulate above and below ; umbilicus broad, 

 pervious ; aperture transversely subcircular ; peristome acute, sim- ^i£=_^ " 

 pie. Greater diameter 5 1 , lesser \\ mill. ; height, 2 mill. 



Helix Whitneyi, Newcomb, Proc. Cal. Acad. Nat. Sci., III. 118 



(1864). — Pfeiffeii, Mon., V. 171 (1868). 

 Patula Whitneyi, Tryon, Am. Journ. Conch., II. 263 (1866). 

 Hyalina Whitneyi, W. G. Binney, L. & Fr.-W. Sh., I. 32, Fig. z. Whitneyi 



37 (1869). 

 Inhabits the California Region in the Sierra Nevada, near Lake Tahoe, Cali- 

 fornia, under damp logs and bark. 

 Animal not observed. 



Zonites nitidus, Muller. 



Vol. III. PL XXII a. Fig. 2. 



Shell orbicular, depressed, moderately convex above and concave below, 

 thin, shining, uniform brownish horn-color, with delicate stria? of growth ; 

 whorls 5 or more, convex, separated by a deeply impressed suture, the outer 

 one disproportionately large, somewhat declining as it approaches the aperture, 

 and obtusely angular at the periphery, beneath excavated around a broad, cra- 

 teriform umbilicus, in which the whorls are displayed to the apex ; aperture 

 oblique, lunate ; peristome simple, its basal margin arcuate. Greater diameter 

 1\, lesser 6 mill. ; height, 3§ mill. 



Helix nitida, Muller, Hist. Verm., II. 32) etc. — Pfeiffer, Mon., II. 94. 

 Helix lucidu, Draparnaud, Moll. Fr., 103, PL VIII. Figs. 11, 12. —Binney, 



Terr. Moll., II. 233, PL XXII. a, Fig. 2. — W. G. Binney, Terr. Moll., 



IV. 116. 

 Helix hydrophila, Ingalls in coll., unpublished. 

 Hyalina nitida, Tryon, Am. Journ. Conch., II. 250 (1866). — W. G. Binney, 



L. & Fr.-W. Sh., I. 31, Figs. 35, 36 (1869). 



Found at Great Slave Lake, Fort Resolution in British America, and in New 

 York and Ohio. Also in Baldwin County, Alabama. I believe, therefore, that 

 it will be found to inhabit all of the Fastern Province, if not the whole North 



VOL. iv. 8 



