176 LAND AND FRESH-WATER SHELLS OF N. A. [pART IV. 



is more robust, and has a shorter spire than that from Kentucliy. 

 The aperture is about three-eighths the length of the shell. I name 

 this after Mr. T. R. Dutton, who sent it to me long since with other 

 mollusca from Tennessee. This must not be confounded with the 

 shell which I called Melania Duttoniaua, Trans. Am. Phil. Soc, vol. 8, 

 pi. 6, which is really a Lithasia. — Lea. 



Differs from G. Tuomeyi in the form of the aperture. The 

 specimens before me are not all double banded, some of them 

 being without bands and of a light j-ellow-eolor. It is a re- 

 markably fine species. 



43. G. laqueata, Sav. 



Melania laqueata, Say, New Harmony Disseminator, p. 275, September, 1829. 

 Say's Reprint, p. 17. American Conchology, No. 5, t. 47, f. 1. BlXN'EY'8 

 edition, pp. 143 and 200. Binney, Clieck List, No. l.')8. DeKay, Moll. New 

 York, p. 97. AVheatley, Cat. Shells, U. S., p. 2.5. Jay, Cat., 4th ed., p. 274. 

 Reeve, Monog. Melania, 6p.281, 288? Brot, List, p. 35. Catlow, Conch. 

 Nomeuc, p. 187. 



Melasma laqueata. Say, Adams, Genera, i, p, 300. 



Melania monosonalis, Lea, Philos. Proc, ii, p. 13, February, 18tl. Pliilos. Trans., 

 Tiii, p. 178, t. G, f. 31. Obs., iii, p. 16. DeKay, Moll. New York, p. 9(i. Binney, 

 Check List, No. 1G8. Troost, Cat. Shells, Tennessee. WiiEAxr.EY, Cat. 

 Shells, U. S., p. 2G. Catlow, Conch. Nomenc., p. 187. Brot, List, p. 40. 



Description. — Shell oblong, conic ; spire longer than the aperture, 

 Fig. 340. Fig. 341. Fig. 342. elevated, acute at tip; volutions moderately 

 convex, with about seventeen, regularly ele- 

 vated, equal, equidistant costaj on the supe- 

 rior half of each volution, extending from 

 suture to suture and but little lower on 

 the spire, and becoming obsolete on the 

 body-whorl; suture moderately impressed; 

 labrura and columella a little extended at base. 



Observations. — This species was found by Dr. Troost in Cumber- 

 land River. Tlie elevated costa?, without any revolving lines, dis- 

 tinguish this shell from the other species of our country.— *Sa?/. 



Figure 340 is a copy of Mr. Say's, which is drawn from a 

 poor specimen. Shells somewhat like it are before me. The 

 species being very variable in outline and marking, two other 

 figures are given. 



Melania monozonalis.— ^hnW folded, fusiform, rather thick, banded, 



