of North, American Ilellcidce. 425 



donia Jan is identical with H. Texasiana Moricanrl. Ferus- 

 sac (Bui. Zool., 1S53) states that it is so. Dr. Binney, looking 

 at specimens bearing Jan's name in tlie Paris Museum, made 

 the following note : "7/! triodonta Jan is the shell which we 

 have from Texas like II. tridentata, with very small teeth ; it 

 seems to run into H. Texasiana Mor." Dr. Binney referred to 

 the shell which I have above described; if Jan's shell is the 

 same, it should bear the name given by him. W. G. Binney 

 sent specimens to PfeifFer, wliose opinion is quoted (Terr. Moll. 

 iv. 7y, pi. 78, fig. 18), that it is var. of //. Texasiana^ but Mr. 

 Binney now concurs with me in considering it distinct. 



H. triodontoides is a more delicate shell than II. 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 whorl is less devious at its termination beneath, the lip 

 teeth are smaller and wide apart. In H. Texasiana they are 

 close together, and the space between them has much resem- 

 blance to the notch in II. hirsuta. In that respect, as well as 

 in the form of the aperture, Moricand's shell is more closely 

 allied to II. Mooreana W. G. By. 



H. Texasiana varies much in size, which is not the case with 



my species. The following are measurements of specimens of 



the former in my cabinet : 



Diam maj. 11|^, min. 9, Alt. 5 mill. 

 a a g a i-i u A a 



Helix inilecta Sny. 



- Say gives g^oths of an inch as the greatest transverse diameter 

 of this species ; the size and other characters are, however, 

 variable. For an extraordinarily large specimen, found at 

 University Place, Tenn., I am indebted to Bishop Elliott ; having 

 5| whorls, it measures, Diam. maj. 16, min. 14, Alt. 7 mill. 



A small var.j Diam maj. 9, min. 8, Alt. 4|- mill., inhabits 

 Taylor Co., Ga. (Dr. Neisler), in which the superior tootli on 



