88 BR. ETHERIDGE ON TERTIARY MOLLUSCA FROM BRAZIL. 
Meranta scatarrorpes, Ether. (PI. VIL. fig. 8.) 
Shell small, turreted, ribbed, or strongly costated; whorls seven, 
ventricose ; sutural constrictions deep; the varices, or costv, are 
nodular about the middle of each varice, producing on each whorl 
a kind of median keel or projection; aperture oblique or ovate. 
Length 53, inch. 
This shell resembles Prososthenia Schwartzi (Neumayr), Sand- 
berger, ‘ Land- und Stisswasser-Conchylien,’ p. 673, t. 32. f.2. I 
may almost say it is the same species, if we may trust the figure in 
Sandberger’s plate. I have doubts, however, about its even being 
a Melania. Nevertheless [name it WM. scalarioides, at the same time 
referring to the above work for comparison. 
Loc. Canama. 
MrLAnta BICARINATA, Ether. (PI. VII. fig. 7.) 
Shell small, elongated ; whorls seven; two carine occur on ail 
except the body-whorl, which has three; considerable space occurs 
between the double lines, and this is occupied by a smooth area, 
which apparently has no markings; aperture elongated; columella 
obtusely carinated and thickened. Length 7 inch. 
Loc. Canama. 
Myuiopatis, sp., or Zrcopatis. (Pl. VII. fig. 13.) 
A single plate only (median or lateral) of a palatal tooth; how it 
came into the freshwater beds of Canama is doubtful, although the 
“rays” are said to oceur high up in the Amazon river. It may, how- 
eyer, have been derived from some Eocene beds within the area. 
Loc. Canama (from the lignite bed). 
EXPLANATION OF PLATE VII. 
. Dreissena acuta, Ether. 
. Anisothyris (Pachydon) tumida, Wther. 
. Corbula canamaensis, Ether. 
. Melanopsis? Brownit, Ether. 
Cerithium coronatwm, Ether. 
. Melania tricarinata, Ether. 
. Melania bicarinata, Ether. 
- Melania scalarioides, Ether. 
. Neritina puncta, Ether. 
10. Neritina ziezac, Ether. 
11. Hydrobia dubia, Ether. 
12. Pseudolacuna macroptera, Bottg. 
13. Myliobatis or Zygobvatis, sp. (plate of a palatal tooth). 
The short lines appended to some of the figures indicate the size of the 
specimens; the rest are of the natural size. 
Fig. 
