HELIX. 



Ill 



western region beyond the Mississippi, and was found 

 quite abundant at Corpus Christi, in Texas, and at the 

 Washita Springs, in Arkansas. 



Remarks. The aspect of this shell is (][uite different 

 from that of any other North American species except 

 H. mobiliana, which is a much smaller shell. Small 

 specimens of II. clausa approach large specimens of this 

 shell somewhat. R. similaris is also allied in its charac- 

 ters. I am inclined to think that H. imchjloma., Menke, 

 is one of the forms of this variable species, [g.] 



7. HELIX HORTENSIS, MtJLLER. 



Plate VIII. 



H. tesla sub-globosa, imperforata, glabra, lutea, unicolore 

 vel fasciata ; anfractibus quinis, ultimo anfractu ventricoso ; 

 labro albo, sub-reflexo, intus incrassato ; basi convexo. 



SYNONYMS AND EEFEBENCES. 



Helix hortmsis, Mullek, loe. cit. 52, No. 247. 

 Gould, Invertebrala, &c. 172. 

 Helix mb-globosa, Binney, Boston Jour. Nat. Hist. I. 485. pi. 17. 



DESCRIPTION. 



Animal. Head and neck blackish, with a shght tinge 

 of brown ; tentacles smoky ; eyes black ; base of foot 

 inky, posterior extremity dirty flesh-color. Foot rather 

 slender, terminating acutely. Respiratory foramen sur- 

 rounded with a blackish circle. Genital orifice indicated 



