GASTEROPODA. 247 
Fossil, 25 species. Wealden—. Turope (v. chemnitzia). 
Sub-genera. Melanatria, Bowdich. M. fluminea.* Pl. VIII, 
Fig. 26. Aperture somewhat produced in front; operculum 
with rather numerous whorls. This section includes some of 
the largest species of the genus, and is well typified by the 
fossil, M. Sowerbii (cerit. melanoides, Sby.), of the Woolwich 
sands. Old World, India, Philippines. 
Vibex, Oken, VY. fuscatus, Pl. VITI., Fig. 29. YV. auritus. 
West Africa. Whorls spirally ridged, or muricated; aperture 
broadly channeled in front. 
Ceriphasia, Sw., ©. suleata. North America. Aperture like 
yibex ; slightly notched near the suture. 
Hemisinus, Sw., H. lineolatus. West Indies. Aperture 
channeled in front. 
Melafisus, Sw, (Io, Lea. Glottella, Gray.) M. fluviatilis. 
Pl. VIII,, Fig. 27. United States. Aperture produced into a 
spout in front. 
Melatoma, Anthony (not Sw.) M. altilis. 
Shell like anculotus; with a deep slit at the suture. United 
States. 
Anculotus, Say. A. preemorsus. Pl. VIIL., Fig. 28. 
Shell globular ; spire yery short; outer hp produced. United 
States. 
Amnicola, G.and H. A.isogona. Pl. [X., Fig. 23. United 
States; inhabits the fresh waters of New England, gregarious 
on stones and submerged plants. 
Chilostoma, Desh. M. marginata, Hocene. Paris. Peristome 
thickened externally, all round. 
Clea, Bens. C.annesleyi. South India. 
PALUDOMUS, Swainson. 
Hiymology, palus, a marsh, and domus, home. 
Synonyms, Tanalia, Gray. Hemimitra, Sw. 
Type, P. aculeatus, Gm. species. Pl. IX., Fig. 
Shell tarbinated, smooth, or coronated ; outer ee sees 
oliyaceous with dark brown spiral lines. 
Distribution, 25 species. Ceylon (Himalaya?) in the moun- 
tain-streams, sometimes at an elevation of 6,000 feet. The 
Himalayan species (melania conica, Gray, hemimitra retusa, Sw., 
and several others), referred to this genus, haye a concentric 
operculum, like paludina. 
* This is a good fection of melanza, but Mr. Gray’s type does not well represent it, . 
being more like a pirena in the form of its aperture, 
