234 LAND AND FRESH-WATER SHELLS OF N. A. [PART IV. 



the latter locality attached to the label. I do not observe the 

 ribs mentioned by Mr. Anthon}-, in the numerous suite of speci- 

 mens before me. 



Melania hicincla. — Shell conical, elevated ; spire very acute ; whorls 

 seven, upper ones bicarinate, and body-whorl encircled by three or 

 four carinas, the upper two of which are carinate, while the lower 

 two are of ten striae merely ; color dark olive-brown, very shining, 

 Fig. 458a. and relieved by a faint or yellow, narrow band near the sut- 

 ure ; sutures distinct ; aperture ovate, and brown within ; 

 columella deeply indented. 

 Habitat. — Tennessee. 



Observations. — K beautifully distinct and well marked spe- 

 cies of .that group which 31. hclla, Conrad may be considered most 

 fitly to represent. May be distinguished from M. hella by its broader 

 and more acute form, more distinct carinatiou and absence of the 

 beaded line so characteristic of that species ; lines of growth con- 

 spicuous and crowded. Differs from M. bicostata (nobis) by its less 

 robust form, darker color and by the form of its spire, which dimin- 

 ishes more rapidly towards the upcs.. — Anthony. 



All the specimens of hicincta before me, including Mr. 

 Anthony's type, are labelled by him "North Carolina," and 

 this shell certainly belongs to a group of species character- 

 izing that State. 



Mdania assimiUs. — Shell small, short, conic, not thick; spire acute 

 composed of about seven, flat whorls; sutures very distinct, of a 

 light horn-color; aperture small, ovate, dusky Vi'ithin; col- _, . 



umella indented ; body- whorl angulated ; sinus not broad, 

 but well formed. 



Habitat. — Tennessee. 



Observations. — A small, delicate species; compared with 

 31. pallidula (nobis) it is more slender and elevated, has a greater 

 number of whorls, and is devoid of bands. From 31. avrjnlata 

 (nobis) it diflers in being more slender, more carinate and having 

 a more elevated spire. — Anthony. 



The above description applies, of course, to 3'oung shells 

 of symmetrica^ in which the cariuye are well developed. 



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