OF CONCHOLOGY. 



165 



DESCRIPTION OP A NEW AMERICAN HELIX. 



BY WESLEY NEWCOMB, M. D. 



Helix Hemphillii, Newc. — Plate 17, fig. 4. 



H. testa sub-lenticulare, late urabilicata, tenuiuscula, corneo- 

 albida cum fuscis lineis obscuris picta, transversim rugoso- 

 striata, apice obtusa ; anfr. 5, supra convexa vel planulati, ulti- 

 mus acute carinatus vel bicarinatus, descendens, basi convexus 

 et in longitudinem tenuissime striatus ; umbilico profundo per- 

 spectivo ; peristoma simplex ; apertura diagonalis, fere rotunda. 



Juniores — acute carinatfB, basi perconvexse, omnino hirsutse 

 cum brevissimis setis. 



Diam. major (adulta) "625 pol. ; diam. minor "55 pol. ; altitude 

 •40 pol. 



Shell nearly lens shaped, widely umbilicate, thinish ; white 

 horn color masked with obscure brownish lines (or without), 

 transversely roughly striated, with an obtuse apex. Whorls five, 

 either convex or flattened above, the last one acutely carinate, 

 or bicarinate, descending in front, base convex with fine longi- 

 tudinal stYise ; umbilicus deep and perspective ; lip simple ; 

 aperture diagonal, nearly round, 



ITab. White Pine Mining; District, at an altitude of 8000 

 feet. 



The above, collected by Henry Hemphill, Esqr., bears some 

 analogy to H. strigosa, Gould, and to II. Qooperi, Bland, but is 

 readily distinguished from either of those species. The hirsute 

 character of the young shell, the larger size and more compressed 

 form, distinguish it from Oooperi ; its strong carination, flattened 

 form and less size, together with the variation in the young, 

 separate it from strigosa. 



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