ZONITES. Ill 



Jaw as usual in the genus. 



The lingual membrane (PL III. Fig. C) has 32—1—32 teeth, with G perfect 

 laterals. 



Of the genitalia I can only state the existence of the dart sac and dart as in 

 Z. ligerus. 



Zonites cerinoideus, Anthony. 



Shell perforated, globosely flattened, shining, light horn-color, scarcely 

 wrinkled by lines of growth ; whorls 7, hardly convex, the last slightly in- 

 flated below ; aperture oblique, subcircular ; peristome simple, 

 acute, its ends joined by a light callus. Greater diameter 7, .^L. ' 

 loser 6 mill.; height, 3 mill. 



Helix cerinoidea, Anthony, Am. Journ. Conch., I. 351, PI. XXV. 



Fig. 4 (Oct. 1865). 

 Mesomphix cerinoidea, Tryox, Am. Journ. Conch., II. 255, PI. IV. 



Fig. 36 (1866). 

 Hyalina cerinoidea, W. G. Binney, L. & Fr.-W. Sh., I. 30, Fig. 



30 (1869). 



Jacksonville, Fla. ; Charleston, S. C. ; Newbern, N. C. ; Norfolk, Va. It 

 may be a species of the Florida Subregion, thence ranging northward along the 

 Atlantic Coast. 



The specimen figured was loaned by Mr. Anthony. 



Animal with mucus pore, longitudinal furrows, and locomotive disk charac- 

 teristic of the genus. 



A form of this or some allied species furnished with two lamellar teeth 

 within the aperture has been noticed as var. cuspidata, by Lewis, Proc. 

 Phila. Ac. Nat. Sc. 1875, 331. 



Jaw as usual in the genus. 



Lingual membrane with 34 — 1 — 34 teeth ; 9 perfect laterals (PI. III. 

 Fig. B). 



Genitalia with dart and sac as in Z. ligerus. 



Subgenus HYALINA, s. s. 



Animal as in Mtsomjih'u (see p. 98). 



Shell umbilicated, sometimes perforated, depressed; shining and vitreous; 

 whorls 5 or 6, regularly increased ; spire very rarely conic-elevated ; aperture 

 rounded lunate; peristome thin, acute, straight. 



Zonites cellarius, Muller. 

 Vol. III. PI. XXIX. Fig. 4. 



Shell very much depressed, thin, fragile, pellucid; epidermis light greenish 

 horn-color, smooth, highly polished ; whorls 5, slightly rounded, with minute 



