ZONITES. 



2S7 



Helix caduca, Pfeiffer, Mon. Hel. Viv. I, 89, &c. — Reeve, Con. Icon. 530. 



— W. a. BiNNEY, Terr. Moll. IV, lU5. 

 Hyalina caduca, Tkyon, Am. Jouru. Conch. II, 248, pi. iii, f. 15 (IStit!). 



Admitted in the catalogue on the authority of Pfeiffer (Roemer's 

 Texas, 455), who quotes it from New Washington. It is a Mexi- 

 can shell : a specimen from that locality is figured (Fig. 513). 



Fig. 514. 



Zonites friabilis, W. G, Binn.— Shell very globose, transparent, 

 brittle, thin, sometimes thick, shining, reddish ; spire very short, conic ; 

 whirls five, convex, lijjhtly wrinkled, rapidly increasing, the last very 

 large and ventricose ; suture moderate ; aperture 

 circular, equally high and broad, witliin bluish and 

 slightly thickened by a very thin white callus ; peri- 

 stome simple, sharp, thin, at its junction with the 

 body-whirl violet-colored and reflected, so as to cover 

 a portion of the small and deep umbilicus ; the 

 parietal wall of the aperture is covered with a light 

 violet-colored callus. Greater diam. 26, lesser 20; 

 height 13 mill. 



Helix friubil is, W. G. Binjjet, Proc. Acad. Nat. Sci. 



Phila. 1857, 187 ; Terr. Moll. IV, 106, pi. Ixxx, f. 2.— Pfeiffek, Mon, 

 Hel. Viv. IV, 346.— Bland, Ann. N. Y. Lye. Vll, 126. 



Helix lucubrata, Pfeiffer, Mon. Hel. Viv. IV, 68 ; Mai. Blatt. 1858, 32, 

 not of Say.' 



Hjalina friahdis, Tryon, Am. Journ. Conch. II, 247, pi. iii, f. 12 (1866). 



Indiana, Illinois, Alabama, Arkansas, Texas. The specimens 

 from the first two States only deserve the specific name, the 

 other localities furnishing quite thick shells. 



Zonites friahilis. 



Zonites laevigata, Pfeiffer. — Shell somewhat convex, oftener 

 depressed ; epidermis greenish horn-color, shining, thin ; whirls five, 

 rather flattened, rapidly enlarging, with beautiful and regular oblique 

 striae and revolving microscopic lines ; the last whirl expanding towards 

 the aperture, not descending ; aperture transverse, broadly lunar, ample, 



' H. lucubrata, Say, is not included in my work, being found beyond the 

 geographical limits embraced. 



