64 A MANUAL OF AMERICAN LAND SHELLS. 



in Arizona ; has been found in California, and has been traced through 

 '^^^- ^^- Mexico into Yucatan ; is quoted from Ber- 



muda, Cuba, Jamaica, and Porto Rico. 

 In Japan it has also been noticed (Ann. 

 Mag. Nat. Hist., June, 1868). I am in- 

 clined to believe, therefore, that it will 



Lingual dentition of Z. ?nt»i.MscM?MS. t•^ rr j- 7 j.i ^^.i 



(Morse.) prove, liKC Z.fulvus, to be one of the cir- 



cumpolar species common to the three continents. It has not, how- 

 ever, thus far been detected in Europe. 



Jaw long, narrow, but slightly arcuate, of almost uniform width, 

 ends rounded; concave margin smooth, with a slightly developed, 

 broad median projection. 



Lingual membrane (Plate III, Fig. H, of T. M., V) — Morse's figure 

 shows 4 perfect laterals. He counted 52 rows of 12-1-12 teeth. It will 

 be noticed that his figure does not show the cutting points of the side 

 cusj)s of the central and lateral teeth, which I have found in speci- 

 mens from Florida. I found a similar number of teeth. 



Zonitcs viD'idtaliis, Menkk. 



Fig 21. Shell umbilicated, small, depressed, thin, fragile; epidermis 

 ■pule, or brownish horn-color, wrinkled, shining; whorls 4, the 

 last rajjidly enlarging towards the aperture ; aperture trans- 

 versely rounded; peristome simple, its edge rather thickened, 

 not acute; umbilicus small, but well marked and constant. 

 Greater diameter 5, lesser 4§'"'" ; height, 2™™. 



Z. viriduliis. 



Helix electriim, Gould, Invert., 183, fig. Ill (1841).— Binney, Bost. Jonrn. Nat. Hist., 

 iii, 423, pi. xxii, fig. 2 (1840); Terr Moll., ii, 286, pi. xxix, fig. I.— De Kay, N. 

 Y. Moll., 30 (1843).— Adams, Vermont Mollusca, 161 f 1842).— W. G. Binney, 

 Terr. Moll., iv, 107.— Mouse, Amer. Nat., i, 542, fig. 31 (1867). 



Helixpura, Alder, teste Pfeiffkr, Mon. Hel., iv, 80. 



Helix janus, Adams MS. (olim), Shells Yt. Amer. Journ. So. [1], xl, 273 (1841). 



Zonites radiatulus, Reeve, Br. L. & Fr.-W. Sli., 50, fig. (1863). 



Zonites striaUila, Moquin-Tandon, Moll., Fr. teste Eeeve. 



Helix viridula, Mexke, Syn. M6tb., ed. 2, 127 ; see also Mai. Bliitt., viii, 92. 



Hyalina electrina, Morse, Journ. Portl. Soc, i, 13, fig. 23, pi. vi, fig. 24 (1864).— 

 Tryon, Amer. Journ, Conch., ii, 251 (1866). 



Hyalina viridula, W. G. Binney, L. Sh., i, 34 (1869).— Gould and Binney, Inv. of 

 Mass., ed. 2, 397 (1870). 



Zonites viridulus, W. G. B., T. M. U. S., v. 



A circumpolar species common to the three continents. In America 

 it has been found from Great Slave Lake to the Gulf of Mexico ; in 

 the Central Province, in Utah, Arizona, Colorado, and New Mexico. 

 I have not actually, as yet, received it from the Pacific Province, ex- 



