50 LAND AND FRESII-AVATER SHELLS OF N. A. [PART IV. 



A. Tuberculate. 

 1. P. alveare, Coxkad. 



Melania alveare, Coxead, New Fresh-Water Shells, p. 54, t.4, f. 7, 1834. DeKay, 

 Moll. N. Y., p. 94. WHEATLEY, Cat. Shells, U. S., p. 24. Jay, Cat. 4th edit., p. 

 272. BiNXEY, Check List, No. 11. Brot, List, p. 30. Hanley, Conch. Misc. 

 t. 8, f. 74. MiJLLER, Synopsis, p. 4G, 1836. 



Megara alveara, Conrad, Chenu, Manuel, i, f. 2022. Adams, Genera, i, p. 306. 



Melania iorquata, LEA, Philos. Proc, ii, p. 242, Dec, 1842. l'hilo.s. Trans., ix, p. 



27. Obs., iv, p. 27. Wheatley, Cat. Shells U. S., p. 27. Bixxey, Check List, 

 No. 271. Adams, Genera, i, 306. 



Jifelanin perjiodosa, L,EA, Fhilos Proc, iv, p. 105, Aug., ISl."). Philos. Trans., x, p. 



66, t. 0, f. 49. Obs., iv. p. 66, t. 9, f. 49. BiNXEY, Check List, No. 202. 

 lo pernodosa, Lea, Adams, Genera, i, p. 229. 



Melaina impern. Say' (j-oungj, American Conchol.. pt. 1, t. 8, middle figure. 

 Melania prochicta.* LEA, Philo.s. Proc, ii, p. 243, Dec, 1842. Philos. Trans., ix, p. 



28. Obs., iv, p. 28. Whe.\tley, Cat. Shells U. S., p. 26. Bixxey, Check List, 

 No. 217. Brot, List, p. 36. 



Melania grossa.* Axthoxy, Proc Acad. Nat. Sci.,p. 59, Feb., 1860. Bkot, List, 

 p. 40. Reeve, Monog., f. 411. 



Description. — Shell short, conical, ventricose; whorls flattened, 

 with a line of wide compressed tubercles at the base of the penul- 

 timate whorl ; body-whorl angulated ; angle armed with prominent 

 tubercles ; base hardly convex, with about five prominent lines ; 

 aperture obliquely elliptical ; less than half the length of the shell. 



Observations. — Inhabits with the preceding species (J/, lima) Elk 

 River, Alabama. The spire is very regularly conical and the base 

 strongly ribbed. — Conrad. 



The figure (No. 99) is from a type specimen in the collection 

 of my friend Mr. Haldeman, who very kindly placed in my 

 Fig. 97. Fig. 98. hands his entire valuable series of Conrad's, 

 Say's and his own types. No. 97 rep- pj„ gg 

 resents a large shell from Coll. An- ^ 

 [\\\j\^ ^^^ thon3\ No. 98 is from a specimen in ^k 

 my cabinet exhibiting the plicate whorls ^^ 

 of the spire. The species is very var able in 

 length. No. 101 represents an elongated specimen from Cum- 

 berland River, Tennessee ; this variety Mr. Lea has described 

 as 31. torqxiata. 



The following are the descriptions of xiernodosa and tor- 

 quata. 



"M. producta and grossa are llie jouiig of a huge variety of alveare. 



