HELIX. 55 



as doubtful. Deshayes says that its anatomical details 

 will decide the question. The dissections of Dr. Leidy 

 have already done so. 



The species occurs in Georgia. 



HELIX DENTIFERA BINNEY vol. ii. p. 134, pi. xii. 



Helix dentifera DEKAY, N. Y. Moll. p. 34, pi. ii. fig. 17. 



MRS. GRAY, Fig. of Moll. An. pi. cxci. fig. 11. 

 nee PFEIFFER, vol. iii. 

 nee CHEMNITZ. 



This is not the dentifera described by Pfeiffer in the 

 third volume of his Monograph, and the second edition of 

 Chemnitz. The species there described and figured is 

 H. Roemeri, confounded by Pfeiffer with dentifera. Its 

 distinguishing features are pointed out in the succeeding 

 article. A copy of Binney's descriptions is given in Mon. 

 Hel. Viv. i. 



It is a mountain shell, has been found by Mr. Edwards 

 in Virginia, Dr. S. E. Shurtleff in Western Pennsylvania, 

 Mr. Conrad at Broad Top Mountain, and Mr. Phillips on 

 the Lehigh. Also in Maine, (E. S. Morse). 



HELIX ROEMERI PFEIFFER. 

 PLATE LXXVII. FIGURES. 



T. anguste umbilicata, depressa, tenui, confertim striatula, diaphana, 

 vix nitidula, sordide carnea, spira vix elevata ; sutura leviter impressa ; 

 anfr. 5 convexiusculis, ultimo peripheria subangulato ; apertura obliqua, 

 lunar! ; peristomate valide albolabiato, margine supero recto, basal! 

 reflexo, ad columellam in laminam tenuissimam, umbilicutn semi-occul- 

 tantem dilitato. (Pfeiffer). 



SYNONYMS AND REFERENCES. 



Helix Roemeri PFEIFFER, in Roemer's Texas, p. 455; Zeitschr. f. Mai. 1848, p. 



117. 



REEVE, Con. Icon. No. 680. 

 Helix dentifera PFEIFFER, Mon. Hel. Viv. iii. 269, (excl. Binney et DeKay). 



CHEMNITZ, ed. 2, ii. 331, pi. cxxxi. figs. 1-3. (Excl. do.) nee 

 BINNEY. 



