114 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



American continent ; also in Astoria, Oregon, which confirms this statement. 

 It is also found in Japan, and thus, like fulvus, may be considered one of the 

 circumpolar species common to the three continents. 



Jaw as usual in the genus. 



Lingual membrane : see Lehmann, Lebenden Schnecken, etc., p. 72, PI. X. 

 Fig. 23, for description and figure of the European form. In a specimen from 

 Baldwin County, Alabama, I find 25 I 25 teeth, with 5 laterals (PL III. Fig. 

 A, the left-hand figure, is an extreme marginal). Lehmann gives 28 1 28. 



The specimen examined had the dart-sac and dart described in the Euro- 

 pean form. 



Zonites arboreus, SAY. 

 Vol. III. PI. XXIX. Fig. 3. 



Shell umbilicated, depressed, very slightly convex, thin, pellucid ; epidermis 

 amber-colored, smooth, shining ; whorls 4-5, with very minute, oblique stria?, 

 apparent when viewed with the microscope ; aperture transversely rounded ; 

 peristome thin, acute ; umbilical region indented ; umbilicus moderate, well 

 developed, round, and deep. Greater diameter 5, lesser 4j mill. ; height, 

 2| mill. 



Helix arborca, SAY, Nich. Encyc., PI. IV. Fig. 4 ; BINNEY'S ed. 5, PI. LXXII. 

 Fig. 5(1816, 1818, 1819). EATON, Zotil. Text-Book, 193 (1826). BINNEY, 

 Bost. Jotirn. Nat. Hist. III. 422, PI. XXII. Fig. 1 (1840) ; Terr. Moll., II. 

 235, PI. XXIX. Fig. 3. DEKAY, N. Y. Moll., 30, PI. II. Fig. 10 (1843). 

 GOULD, Invertebrata, 182, Fig. 110 (1841). ADAMS, Vermont Mollusca, 

 160 (1842). PFEIFFER, Mon. Hel. Viv., I. 95. CHEMNITZ, 2d ed., II. 114, 

 Tab. LXXXV. Figs. 33 - 35. REEVE, Con. Icon., 733. W. G. BINNEY, 

 Terr. Moll, IV. 116. MORSE, Amer. Nat., I. 542, Fig. 30 (1867). 



Helix Ottonis, PFEIFFEK, olim, Weigm. Arch., 1840, I. 251. BINNEY, Terr. 

 Moll., II. 238, PI. XXIX. a, Fig. 3. W. G. BINNEY, T. M., IV. 117. 



Hyalina arborea, MORSE, Journ. Portl. Soc., I. 14, Fig. 28, PI. VI. Fig. 29 

 (1864). TRYON, Amer. Journ. Conch., II. 251 (1866). GOULD and BINNEY, 

 Inv. of Mass., ed. 2, 396 (1870). W. G. BIXNEY, L. & Fr.-W. Sh., I. 33 

 (1869). 



Hyalina Ottonis, TRYON, Amer. Journ. Conch., II. 251 (1866). 



Helix Brcweri, NEWOOMB, Proc. Cal. Acad. Nat. ScL, III. 118 (1864). 



Hyalina Breweri, TKYON, Amer. Journ. Conch., II. 250, PL IV. Fig. 27 (1866). 

 - W. G. BINNEY, L. & Fr.-W. Sh., I. 43, p. 66 (1869). 



From Labrador to Texas and on the Rio Chama, and Fort Wingate in New 

 Mexico ; from Florida to Great Slave Lake ; also in Washoe County, Nevada ; 

 in Montana ; the Pacific Province from British Columbia to San Diego. It 

 may thus be said to inhabit all North America. It is also said to be found in 

 Cuba ; also in Guadeloupe. 



Jaw arcuate, narrow, with curving, pointed ends ; lower margin smooth, with 

 a wide median projection ; upper margin with a corresponding depression. 



