AND DESCRIPTIONS OF NEW SPECIES. 101 



able to refer it to any described species, have given it a place here. 

 It resembles the virginica (Say), but differs greatly in elevation, the 

 virginica having about seven whirls only. The carina causes the 

 whirls to be flatter in the subularis. In some specimens the columella 

 is purple. 



Melania Tuberoulata. Plate XV. fig. 31, a, b. 



Testa obtuse turrita, lata, tenebroso-fuscu aid nigrante; apice obtuso; anfractibu$ 

 quinque; medio anfractus ultimi tuberculis instructo; labro cnormiter curvo ; basi 

 angulatd; aperturd purpurea, dimidium longitudinis testes habente. 



Shell obtusely turrited, wide, very dark brown or black; apex obtuse ; whirls five ; 

 middle of the last whirl furnished with tubercles; outer lip irregularly curved; base 

 angulated ; aperture purple and one half tiie length of the shell. 



Hab. Tennessee river, Professor Vanuxem. 



My Cabinet. 



Cabinet of Professor Vanuxem. 



Cabinet of P. H. Nicklin. 



Cabinet of Academy of Natural Sciences. 



Diam. -5, Length -9, of an inch. 



Remarks. — This species is somewhat allied to the M. armigera 

 (Say), but is smaller and much less ponderous. The tubercles are more 

 numerous and less elevated. In the tuberculala the impressed band, 

 which exists in the armigera above the armature, is wanting. In co- 

 lour it differs altogether, 



Melania Acuta. Plate XV. fig. 32. 



Testa acute turritd, tenui, corned; apice acuta; anfractibus octo, supra suturam 

 carinatis, in longum undatis, transversim lineatis; basi angulatd; aperturd alba, 

 quadrantem longitudinis testa habente. 



Vql. IV.— 3 A 



