NEW MELANID.E OF THE UNITED STATES 295 



TrYPANOSTOMA MONILIFERtni. PI. 36, fig. 125. 



Testa tubcrculata, crassa, pyrauiidata, vel luteola vel vircutc, vittata vel cvittata ; spira elevato-pyramid- 

 ata ; suturis irregulariter iuipressis ; aufractibus instar denis, planulatis, inferno striatis, intcrdum ob- 

 solete sulcatis, ad pei'ipheriam tubereulatis ; apertura subgrandi, rbomboidea, intits vel albida vel 

 salmonia, plerumque bivittata ; labro acuto, valde sinuoso ; columella inferne incrassata, et valde con- 

 torta. 



Shell tuberculate, thick, pyramidal, yellowish or greenish, banded or without 

 bands; spire high, pyramidal ; sutures irregularly impressed; whorls about ten, flat- 

 tened, striate below, sometimes obscurely sulcate, tuberculate on the periphery ; ap- 

 erture rather large, rhomboidal, within either white or salmon and generally double 

 banded ; outer lip acute, very sinuous ; columella thickened below and very much 

 twisted. 



Operculum ovate, very dark-brown, with the polar point near the base. 

 Proc. Aead. Nat. Sci., 1862, p. 172. 



Hob. — Tennessee, Prof. Troost and Mr. Anthony ; Florence, Alabama, Rev. 

 G. White, Mr. Pybas and Mr. Thornton ; Cumberland River, Dr. Powell ; Ohio River, 

 near the mouth, in Illinois, J. Ronaldson ; New Harmony, Indiana, Mr. Carley and 

 Mr. Sampson ; Warrior River, Alabama, Prof. Brumby. 



My cabinet and cabinets of Prof. Troost, Mr. Anthony, Mr. Carley, Mr. Anthony 

 and Dr. Hartman. 

 Diam. -07, Length 1-53 inch. 



Remarks. — This is among the largest species of the Melanklaa which inhabit the 

 waters of the United States. It has usually been considered a variety of Melania 

 (Trypanostoma) undulata, Say, but it is easily distinguished by its being longer and 

 narrower in the outline, in having a greater number of whorls, and in having more 

 and smaller tubercles on the periphery of the last whorl. This usually has twelve or 

 thirteen, while undulata has seven or eight. Few individuals are without bands, and 

 there are usually two broad ones more distinct within than without. These two 

 bands are sometimes separated into four. The three or four first whorls are usually 

 carinate. The tubercles, which are usually beautifully defined, are highly ornamental, 

 but usually do not exist above the ultimate and penultimate whorls. This species 

 seems to be widely distributed, and few or none of our species are more beautiful. 

 There is usually a revolving raised line above and parallel with the row of tubercles. 

 The color of the epidermis varies much. Some specimens are of a rich straw yellow, 

 and others are greenish, while others again are of a deep olive brown, with a fine 

 natural polish. Some have the upper band so broad that a single whitish line is visi- 

 ble under the suture. This may be remarked more particularly in the specimens 

 from the vicinity of New Harmony. The apeiture is about one-third the length of 

 the shell. 



