250 . Bulletin American Museum of Natural History [Vol. LII 
I 
Various species of Melanatria were reported from West Africa by 
Reeve from specimens in Cuming’s collection, but the genus is now gen- 
erally admitted to be special to Madagascar. 
Key to Ethiopian Genera of Melaniide 
(Exclusive of Specially Tanganyikan Forms) 
1. Lip sinuous, retracted basally and above, or with the base channelled distinctly . 2. 
Outer lip scarcely or not sinuous; base sometimes effuse but not channelled. . . 4. 
2. Spire long; shell with both axial and spiral sculpture, at least in early stages; 
Er CUn meno Ne alee ieatits, « shar uibey a a), Os permeates bs wae 3 3. 
Spire short; form ovate; smoothish, with some basal spirals; aperture channelled 
Ihe anEy gr ed ce Mt aN ide aie narc wcidiu amas 3 Rhinomelania E. v. Martens. 
3. Solid, rather large forms of brackish water; operculum very narrow. 
Pachymelania E. A. Smith. 
Rather thin, moderate or rather small forms of fresh-water; operculum ovate. 
Melanoides Olivier. 
4. Oblong-conic, spinose at the shoulder; operculum with basal nucleus. 
Melania Lamarck. 
Oblong-conic to turrited, the summit often eroded, solid, smoothish, or with 
spiral sculpture; operculum with well-developed spiral figure below the 
Se I ire RRC te Cae et OR Bar hea Make fee eis NRE BOE Potadoma Swainson. 
Ovate or conic, of moderate or small size, often perforate; smooth, spirally sculp- 
tured, or nodulous; operculum mainly concentric, with a spiral nucleus at 
PLOW MATH tS Veme MMs ap caine, cetie es” vi ols enya ak a onseoaienns Cleopatra Troschel. 
Melaniinse 
MeELAnIA Lamarck 
Thiara Rovine, 1798, ‘Museum Boltenianum,’ II, p. 109. Monotype: Helix 
amarula Linnzus, the other species mentioned by Réding being nomina nuda. 
Melania Lamarck, 1799, Mém. Soc. Hist. Nat. Paris, p. 75. Monotype: Helix 
amarula Linnezeus. | 
Melas Denys DE Montrort, 1810, ‘Conchyl. Systém.,’ II, p. 323. Monotype: 
Melas melanus Denys de Montfort = Helix amarula Linnzeus. 
Melanidia Ra¥INESQUE, 1815, ‘Analyse de la Nature,’ p. 144. Type: Helix 
amarula Linneus, designated by Pilsbry, 1917, The Nautilus, XXX, p. 110. 
Melacantha Swainson, 1840, ‘Treatise on Malacology,’ pp. 199 and 341. Type: 
Helix amarula Linnzus, designated by Hermannsen, 1847, ‘Ind. Gen. Malac.,’ IT, 
Dp. 26. 
Amarula G. B. Sownrsy, Jr., 1842, ‘Conchol. Man. 2d Wap. 6F ‘Type: 
_ Helix amarula Linneus, designated by Hermannsen, 1846, ‘Ind. Gen. Malac.,’ I, 
joao ie 
Spirilla ‘‘Humph. Mss.,’”’ in Gray, 1847, Proc. Zool. Soc. London, p. 152. Asa 
synonym of Melania Lamarck, with Helix amarula Linneus given as type. 
Itthoparches GistEL, 1848, ‘Naturgesch. Thierr. f. Héhere Schulen,’ p. ix. 
Substitute for Melania Lamarck. 
