ZONITES. 125 



Zonites fulvus, Draparnaud. 

 Vol. III. PI. XVII. Fig. 4. 



Shell imperforate, sub-conical, thin, pellucid; epidermis smooth, shining, 

 minutely striated, amber-colored ; whorls 5 or 6, rounded, very narrow ; suture 

 distinct and deep ; aperture transverse, narrow ; peristome simple, acute ; base 

 convex; umbilical region indented, umbilicus closed. Greater diameter 4, 

 lesser 3| mill; height, 3 mill. 



Helix chersina, Say, Journ. Phila. Acad., II. 156 (1821) ; Binney's ed. 18, 81. — 



Binney, Bost. Journ. Nat. Hist., III. 416, PI. XXVI. Fig. 3 (1840) ; Terr. 



Moll., II. 243, PI. XVII. Fig. 4. —Gould, Invertebrata, 185, Fig. 105 (1841). 



— Adams, Vermont Mollusca, 162 (1842); Sillim. Journ. [i], XL. 273.— 



DeKay, N. Y. Moll, 44, PL XXXV. Fig. 338 (1843). — W. G. Binney, Terr. 



Moll., IV. 119. —Morse, Amer. Nat., I. 544, Fig. 38 (1867). 

 Helix egena, Say, Journ. Phila. Acad., V. 120 (1825); Binney's ed. 30.— 



DeKay, N. Y. Moll., 45 (1843). —Chemnitz, ed. 2, I. 237, PL XXX. Figs. 



19-21? (1846). — Reeve, Con. Icon., No. 1263 (1854). — Pfeiffer, Mon. 



Hel. Viv., I. 31, not of Gould in Terr. Moll. 

 Helix fulva, Draparnaud, Mighels, Bost. Journ., IV. 333, — Chemnitz, 



Pfeiffer (Mon. H., I. 30), Reeve, Forbes and Hanley. 

 Conulus chersinus, Morse, Journ. Portl. Soc. I. 19, Figs. 44, 46 ; PI. II. Fig. 4 ; 



PI. VII. Fig. 45 (1864). 

 Conulus chersina, Tryon, Am. Journ. Conch. II. 256 (1866). 

 Hyalina fulva, W. G. Binney, L. & Fr.-W. Sh., I. 46, Fig. 73 (1869). 

 Hyalina chersina, Gould and Binney, Invert, of Mass., new ed. 402 (1870). 



A circumpolar species, common to the three continents. It appears to in- 

 habit all of the Eastern Province, having been found from Great Slave Lake to 

 Texas and Florida. In the Pacific Province it has been found in Sitka, and at 

 Lake Tahoe and San Gorgonio Pass in California. In the Central Province 

 in Colorado and Nevada. It may eventually be found to inhabit the whole 

 North American continent. 



Animal bluish black upon the head, neck, and eye-peduncles, lighter on the 

 sides ajid base ; foot very narrow, threadlike, with a caudal mucus pore. 



Jaw arcuate, ends attenuated ; anterior surface smooth ; concave margin 

 smooth, with an obtuse median projection. 



Lingual membrane: Morse gives 80 rows of 18 — 1—18 teeth, with 7 lat- 

 erals. The specimen examined by me (from Orono, Maine) has 30 — 1 — 30 

 teeth, with 8 perfect laterals. The difference in the number of the marginals 

 is unusual for two individuals of the same species. 



The peculiarity of the lingual is the bifurcation of all the marginal teeth. 

 On PI. II. Fig. E, I have drawn one central with its adjacent lateral, and one 

 marginal extracted from a Maine specimen. 



By the bifurcation of the marginals this species is allied to Vitrinoconus 



