8 THE NAUTILUS. 



Although in shape and apertural parts much like V. ovata Say, 

 ovulinn is quite distinct, but it should be compared carefully with V. 

 antivertigo Drap., of Europe. 



A NEW AMERICAN HELIX. 



BY C. W. JOHNSON AND H. A. PILSBRY. 



A collection of shells made during the past winter at AVoodville, 

 Jackson Co., Alabama, by Mr. H. E. Sargent, and submitted to us for 

 determination, contains numerous specimens of a large Helix, which 

 proves to be undescribed. The species is a member of the section 

 Triodopsis but it does not exhibit the characters typical of that 

 group, i. e., a three-toothed aperture, but rather belongs in the 

 neighborhood of the Helix appressa of Say, a species which lacks 

 the upper lip tooth of Triodopsis. The new species may be 

 described as follows : 

 H. Sargenti n. sp. 



Shell depressed, imperforate, lens-shaped, carinated. Surface 

 strongly rib-striate, the striation disappearing toAvard the center of 

 the base ; under a lens the surface between the rib-like stride is seen 

 to be finely granulated. The aperture is wide, oblique ; lip broadly 

 reflexed, flattened, the basal lip bearing a long lamella, as in H. 

 appressa. Upon the parietal wall there is a strong, high curved 

 tooth, like that of ^. elevata but longer. There are 6 whorls. The 

 color is light russet above, paler or whitish below. 



Alt. 11, diam. 24 mm. 



Alt. 12, diam. 24 mm. 



Alt. 9, diam. 22 mm. 



This species differs from H. appressa in its larger size, stronger 

 striation, the granulated instead of spirally striate microscopic 

 sculpture, the strong carination, etc. It is allied in shape and 

 sculpture to H. carolinensis Lea, but differs in totally lacking the 

 upper lip tooth, in being flatter, more concave below, etc. The 

 young shells differ markedly from young H. appressa, being flatter 

 above, acutely carinated, and broadly umbilicated. 



Figures will be published later, illustrating this unusually large 

 and strongly characterized species. 



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