352 NEW MELANIDiE OF THE UNITED STATES: 



My cabinet and cabinet of Smithsonian Institution. 

 Diam. -29, < Length -80 inch. 



Remarlis. — Among the Melanidce sent to me by Prof. Henry, Secretary of the 

 Smithsonian Institution, were a few of this species, which I at first regarded as a 

 variety of Melania {Trypanostoma) uncialis, Hald., but it is certainly a distinct species. 

 In the spire it is very much the same, but the color is paler, and in the form 

 of the aperture it is quite different,— uncialis having a retrose channel at the base, 

 while our species curves towards the front and has a more delicate columella, and is 

 altogether more fragile. All the specimens before me have six revolving striae on 

 the lower whorl, below the periphery. The aperture is not cpiite one-third the 

 length of the shell. I have sincere pleasure in dedicating this species to my friend, 

 Prof. Joseph Henry, Secretary of the Smithsonian Institution, who liberally has 

 placed the fresh-water mollusca of that admirable Institution under my examination. 



Trypanostoma lativittatum. PI. 39, fig. 223. 



Testa earinatS., subattenuata, subtenui, fulgida, tenebrosa, late vittata ; spira conoidea; suturis linearibus ; 

 anfractibus instar septenis, superne planulatis, ad basim luteis; apertura parva, rhoniboidea, intus 

 lativittata; labvo acuto, sinuoso ; columella incurva, inferno incrassata. 



Shell carinate, subattenuate, rather thin, shining, dark, broadly banded ; spire 

 conical ; sutures linear ; whorls about seven, flattened above, yellow at the base ; 

 aperture small, subrhomboidal, broadly banded within; outer lip sharp, sinuous; 

 columella bent in, thickened below. 



Proc. Acad. Nat. Sci., 1862, p. 273. 



Hah. — Chikasaha River, Alabama, W. Spillman, M. D. 



My cabinet and cabinet of Dr. Spillman. 

 Diam. *26, Length - 62 inch. 



Remarlis. — Tins is a small, gracefully-formed species, with a very broad, intensely- 

 brown band around the middle of the whorl. There is a second narrow band 

 immediately under the suture. The angle forming the carina is continued, is well 

 defined on all the whorls, and immediately below it is a hair-like elevated line 

 parallel to it. The area at the base of the columella is of a fine yellow, and con- 

 trasts sharply with the dark-brown band above. It is allied to Ckikasahaemis 

 (nobis), but differs in being more gracefully slender, having different bands and 

 less impressed sutures. The aperture is about one-third the length of the shell. 



Trypanostoma strictum. PL 3, fig. 224. 



Testa carinata, subattenuata, tenui, diaphana, pallido-eornea, uno-vittata ; spira regulariter cornea ; 

 suturis liuearibus ; anfractibus instar senis, superne planulatis ; apertura parviuscula, rliomboidea, 

 intus albida et uno-vittata; labro acuto, parurn sinuoso; columella parum incurva et contorta. 



Shell carinate, rather attenuate, thin, semi-transparent, pale horn-color, single- 



