94 



LAND AND FRESH-WATER SHELLS OF N. A. [PART I, 



and figure. — Reeve, Con. Icon. no. 707. — Binney, Terr. Moll. II, 191, 



pi. xlv, f. 1.— W. G. BiNNEY, Terr. Moll. IV, 79. 

 Helix auriculata, Binney, Bost. Journ. Nat. Hist. Ill, 387. 

 Helix tamaulipasensis, Lea, Proo. Acad. Nat. Sci. Philad. 1857, 102; 



Journ.— ; Obs. XI, 139, pi. xxiv, f. 113. 

 Dcedalochila texasiana, Tkyon, Am. Journ, Conch. Ill, 62, pi. x, f. 5, 36, 



38 (1867). 



Texas and the neighboring Mexican State of Tamaulipas. 

 There is a variety larger, with six whirls, and with a brown 

 band revolving above the periphery. 



Fig. 169. 



Helix triodontoides. Bland. — Shell umbilicated, globose-de- 

 pressed, thin, subpellucid, pale horn-colored, with partially obsolete rib- 

 like striae above ; base convex, smooth ; spire short ; whirls five, somewhat 

 convex, the last plicately ribbed near the aperture, deflexed anteriorly ; 

 aperture roundly lunate, oblique, contracted ; peristome re- 

 flected, callous, the margins joined by a sharp linguiform tri- 

 angular tooth, the right with a tooth on the margin of the callus, 

 basal with an oblique tooth, both teeth small and far apart. 

 Greater diam. 9^, lesser 8 ; height 5 mill. 



Helix triodontoides, Bland, Ann. N. Y. Lye. VII, 424, pi. iv, 

 f. 11, 12 (1861). 

 Helix texasiana, W. G. Binney, Terr. Moll. IV, 79, pi. Ixxviii, f. 18. 

 Dcedalochila triodontoides, Tkyon, Am. Journ. Conch. Ill, 62, pi. x, f. 10, 

 31 (1867). 



Corpus Christi and De Witt Co., Texas. 



JET. triodontoides is a more delicate shell than H. texasiana, 

 and does not attain the same size. It is not as distinctly ribbed, 

 is somewhat more elevated, and the aperture is more round. The 

 last whirl is less devious at its termination beneath, the peristome 

 teeth are smaller and wide apart. In H. texasiana they are close 

 together, and the space between them has much resemblance to 

 the notch in K hirsiita. In that respect, as well as in the form 

 of the aperture, Moricand's shell is more closely allied to H. 

 mooreana, W. G. Binn. 



