( 27 ) 
DIVISION XIV. ELLIPSOSTOMATA. 
GENERA. 
A. Longitudinally volute; the last whorl considerably larger than 
the preceding. 
4. Lymnaxus. (1) Lam. 
Spire oblong; thin; no _Columella* with a lon- In stagnant waters 
operculum. vf. 6, fig. 12. gitudinal fold entering and marshes. 
obliquely intothe mouth. VY. Animal, p. 63. 
2. Paysa. Drap. : 
Spireshort or moderate; | Columella simple. In springs. 
very thin; no operculum. V. Animal, p. 63. 
Pl. 6, fig. 13. 
3. Meranta. (2) 
Outer lip advancing and cage Fh lay a, Marine and Fresh 
narrowing the mouth; an Water. - 
operculum. V. Animal, p. 67. 
a. Melania, Zam, 
Peristoma complete, Turreted. Fluviatie. Isle of France. 
effusive (3) at the base Madagascar. East Indies. 
of the columella; black. 
P1.6, fig. 14. 
6. Melantho. 
Peristoma incom-  Sub-globular. Marine. 
plete, not effusive ; very 
thick: white. Pl. 6, 
fig. 45. 
c. Melanopsis, Lam. 
Peristoma incom- Turreted. Fluviatic. 
plete, inner lip very 
broad, reflected, effu- 
sive; black. Pl. 6, fig. 
18. 
d, Melanella, Dufresne. 
Semi-transparent, Turreted; spirecurved. = Marine. 
mouth invaded by the 
last whorl; white. Pl. 
6, fig. 17. 
(1) Foss. in the Cowes Roch of Limestone; Grignon ; 1st and 2nd Fresh Water 
Formations of the environs of Paris. * See the section Pl. 12, fig. 16. 
(2) I have ventured to separate the marine Melanizx, under the name of Melantho, 
the Melanella (in the cabinet of M. Dufresne), and the Melanamona; adding the 
‘name of Melanatriato Lamarck’s Pyrene, in order to indicate its connexion with the 
others. Foss. in the London Clay; Purbeck Limestone; Coral Rag; Blue Lias ; at 
Grignon, Courtagnon, Houdan, Parnes and Ponchartrain. The fossil species of Me- 
lania found at Grignon differ remarkably from the fresh water species. In the M. 
costellata, pl. 13, fig. 14, the peristoma is continuous, but the mouth is not circu- 
lar, and it is entirely detached from the columella towards the upper part of the 
lip. In the M. cochlearella, pl. 13, fig. 13, the lip is prolonged like a spoon; in the 
M. marginata, pl. 13, fig. 10, the peristoma is margined or thickened. The fluviatic 
Melaniacbrought by Olivier from the East are very distinct in appearance from all other 
species: see Pl. 8, fig. 14, 17, This Genus is, probably, entirely foreign to Europe. 
(3) Versante is the French term, which they explain by saying if the shell were 
laid on its back and filled with water, it would run out at this part of the mouth: 
this has beep concluded to be the meaning of Linnzus’s term E/fusus, but it appears 
improbable that he should take a perfect instead of a present participle, when we 
consider his Latinity. 
