198' • MELANIA. 



- described : '1 Cylindrical, resembling Pupa, but- lias a horny 

 operculum ; spire not thickened ; teeth or fold on the pillar 

 none, flavula *Sm;. En. Meth. 461. f. 6, brunnea Guild. (Jiff. 97. 

 ff. h. 1.) Sw. p. 336." Mr. Gray applies the name to those 

 species which have '* a groove or ridge in front of the mouth 



'^ near the pillar." Ex. Cyclostoma Flavulum, Sowerby's The- 



- saurus Conchyliorum, PI. xxiv. fig. 66, 67 ; and our fig. (same 

 species?) Pl.zxv. fig. 529. 



MEGrAEIMA. Eafinesque. A genus proposed to include species 



- of TeHebbatula, Auct. which are smooth and nearly ec^uivalve. 



■ T. Isevis, T. crassa, T. truncula. 



MEGASPIEA. Lea. {Meyag, tnegas, great, and spire.) M. Eu- 

 schenbergiana, (fig. 294) is a pupiform land shell, remarkable 



■ for the length of its spire, which consists of no less than twenty- 

 . five close set, narrow, gradually increasing v^horls. The outer 

 ' Hp is simple, slightly ' thickened ; the inner lip has a tooth on 



■ the body-whorl, and two folds on the columella. Only one 

 species of this singular shell is known. PL xiv. fig. 294. 



MEGtATHYEIS. D'Orbigny. A genus of Brachiopoda repre- 

 • sented by M. cistellula. Eorbes and Hanley, British MoUusca, 



and Teretrabula decoUata, Sowerby's Thesaurus Cjonchyliorum. 



PI. Ixxi. fig. 68 to 70. 

 MEGtATEEMA. Leach. M. S. ? A genus composed of those 



■ species of Ptegoma, Auct.which havealargeaperture. Pl.i.fig.33. 

 MELACANTHA. Sw. A sub-genus of Melania. Sw. p. 341. 

 MELAEUSUS. Sw. A sub-genus of Melanopsis. Sw. p. 341. 

 MELAMPUS. Montf. Conotulum, Lam. A genus composed 



of species of Aueicula, Auct. of a conical form. A. conoidalis, 

 fig. 298. 

 MELANIA. Auct. (MeXa?, melas, black.) Fam. Melaniens, 

 Lam. EHipsostomata, Bl. — Descr. Turrited; spire generally 

 elongated, acute ; aperture entire, oval or oblong, pointed at the 

 posterior extremity, rounded anteriorly, with a kind of indistinct 

 canal or sinuosity ; epidermis thick, generally black. — Obs. In 

 common with other fresh-water shells, the Melanise are fre- 

 ■ quently found with corroded apices. This genus is known from 



