perfectly and rudely developed, appears to be a character 

 of the species. 



Species 421. (Mus. Anthony.) 



Melania Showalteri. Mel. testa obeso-ovatd, solidd, 

 fulvescente-olivaced, fusco trifasciatd, spird brevi, 

 anfractibus superne obsolete rude plicato-tuberculatis, 

 deinde convexis ; aperlitrd ovatd, columella callosd, 

 ad basin parum effusd. 



S no Walter's Melania. Shell stoutly ovate, solid, ful- 

 vous-olive, encircled with three fuscous bauds, spire 

 short, whorls obsoletely rudely plicately tubercled at 

 the upper part, then convex ; aperture ovate, co- 

 lumella callous, but little effused at the base. 



Lithasia S/iotcalleri, Lea. 



Hab. Alabama, United States. 



Of a more obtuse and rounder growth than the prece- 

 ding species, with a shorter spire. 



Species 422. (Mus. Anthony.) 



Melania nodata. Mel. testa couico-ovatd, livido-olivaced, 

 anfractibus panels, declivibus, ultimo ventricoso, ad 

 periplieriam obtuse amjulato et tuberculaio; aperturd 

 late ovatd, fauce purpureo tinctd, columella redd, 

 tenue expansd. 



The knobbed Melania. Shell conically ovate, livid- 

 olive, whorls few, sloping, the last ventricose, ob- 

 tusely angled and tubercled at the periphery ; aper- 

 ture broadly ovate, stained with purple within, co- 

 lumella straight, thinly expanded. 



Melania tuberculata, Lea (not of Miiller). Trans. Amer. 

 Phil. Soc. vol. iv. pi. 15. f. 81 a, b. 



Hab. Tennessee, United States. 



Chiefly distinguished by its tuberculated structure, the 

 tubercles not being at the upper part of the whorls, but 

 round the periphery. 



Species 423. (Mus. Anthony.) 



Melania nuclea. Mel. testa obtuse ovatd, subglobosd, 

 solidd, fidvo-olivaced, fusco trifasciatd, spird subim- 

 mersd, anfractibus quatuor, rude convexis, aperturd 

 late ovatd, parvd, columella ad basin calloso-reflexd. 



The kernel Melania. Shell obtusely ovate, some- 

 what globose, solid, fulvous-olive, encircled with 

 three brown bands, spire slightly immersed, whorl - 

 four, rudely convex; aperture broadly ovate, small, 

 columella callously reflected at the base. 



Lithasia nuclea, Lea. 



Hab. Alabama, United States. 



This little species seems to be rather variable in growth, 

 the spire being more immersed in some specimens than in 

 others. 



Species 424. (Mus. Anthony.) 



Melania abbreviata. Mel. testa subacuminato-ovatd. 

 olivaced, spird acuta, anfractibus quatuor ad quingue, 

 modice convexis, lavibus ; aperturd ovatd, ad basin 

 parum effusd. 



The short Melania. Shell somewhat acuminately 

 ovate, olive, spire sharp, whorls four to five, mode- 

 rately convex, smooth ; aperture ovate, but little 

 effused at the base. 



Anthony, Pro. Nat. Hist. Soc. Boston, 1851. 



Hab. Tennessee, United States. 



A simple well-formed shell, devoid of sculpture, with a 

 sharper apex than usual. 



Species 425. (Mus. Anthony.) 



Melania expansa. Mel. testa conico-ovatd, olivaced. 

 brunneo obscure fasciatd et tinctd, suturis pallidis, 

 anfractibus quatuor ad quinque, superne contracto- 

 declivibus, loiujitudinaliter rude plicato-striatis ; aper- 

 turd ovatd, subampld, ad basin attenuato-effusd, co- 

 lumella excavato-appressd, purpurea. 



The expanded Melania. Shell conically ovate, olive, 

 obscurely banded and tinged with brown, suture> 

 pale, whorls four to five, contractedly sloping round 

 the upper part, longitudinally rudely plicately striated ; 

 aperture ovate, rather large, attenuately effused at 

 the base, columella excavately appressed, purple. 



Lea, MS. in Mus. Anthony. 



Hab. Tennessee, United States. 



Distinguished, it may be observed, by a range of cha- 

 racters peculiarly its own. 



