802 GLASS XIII. 
Sp. Ampullaria fasciata Lam., Helix ampullacea L., Rumpx. Amb. Rariteith. 
Tab. 27, fig. @, Encycl. méth., Vers. Pl. 457, figs. 3, A, B, &c. Fresh-water 
molluses of tropical countries, much allied to Paludina and Cyclostoma 
See F. H. TroscHet Anatomie von Ampullaria urceus und ueber die Gat- 
tung Lanistes Montr. in Ertouson’s Archiv f. Naturgesch. 1845, 8. 197— 
216, Taf. 8. To Ampullaria belongs also Planorbis Cornu Arietis LAM. 
Planaxis LAM. 
Sp. Planawis sulcata Lam., Buatnv. Malacol. Pl. 16, fig. 14. 
Rissoa FremMiNy. Shell mostly turrite, sometimes globose, 
with oval aperture, labrum incrassate, exsert anteriorly and sub- 
arcuate near the columella, the apex acuminate. Operculum 
horny. Tentacles elongate. yes placed at the base of tenta- 
cles. Foot oblong, anteriorly truncated, posteriorly acuminate. 
This genus consists of small marine animals, whose little shell has some 
resemblance to Turbo or Scalaria, and of which the numerous species have 
become known in the last few years alone; there are also many fossil 
species, almost all from the tertiary formations. Compare DESHAYES in 
Lamarck Hist. nat. des Ani. s. vert. 2e éd. VII. pp. 461—485; J. ALDER 
Ann. of Nat. Hist. x11. pp. 323—328; Lovin Ind. Molluscor. éfversigt, 
1846, pp. 24—26. 
Melania Lam. Shell turrite, with apex often decorticated, 
eroded. Aperture entire, ovate or oblong, effuse at the base. 
Columella smooth. Operculum horny, elongate. Animal elon- 
gate, with foot small, and two elongate filiform tentacles. 
Note—Genus Pirena Lam., Pyrena MENKE, GRAY is, according 
to DEsHAYES, to be abolished. Smooth and shining marine species 
of Melania form the sub-genus Hulima Risso. The rest of the 
species, all fluviatile, form the sub-genera Melania, and Melanopsis 
Frruss., Lam. 
Sp. Melania amarula Lam., Helix amarula L., Rumen. Amb. Rariteith. Tab. 
33, fig. F, F; Buatnv. Malacol. Pl. 35, fig. 7;—Melania Rangit Dusu., 
Melan. tuberculosa RanG, GuéRIn Mag. de Zool. 1832, Moll. Pl. 13 (a fig. 
with the animal) &c. The species are especially numerous in the rivers and 
fresh waters of the Sunda Islands ; comp. Mousson Mollusken von Java, 
1849, s. 65—79. An European species, Melan. helvetica MICHELIN, GURER. 
Mag. de Zool. 1831, Moll. Pl. 37, forms the typus of the gen. Pyrgula DE 
CHRISTOF. and JAN.; DESHAYES thinks this species ought not to be sepa- 
rated from Melania; others refer it to Paludina. 
(Melanopsis. Columella truncated, disjoined from labrum by a 
sinus.) 
