82 R, ETHERIDGE ON MOLLUSCA FROM 
APPENDIX. 
Nores on the Motnusca collected by C. Barrineton Brown, Esq., 
A.R.S.M., from the Trrttary Deposrrs of Soriméns and JAVARY 
Rivers, Braziz. By R. Erarripver, Esq., F.R.S., V.P.G.S. 
THe collection of Tertiary Mollusca made by C. B. Brown, Ksq., to 
illustrate a portion of his investigation of the geological features of 
certain portions of the Upper Amazon, although few in species, is 
nevertheless of value on account of its showing a considerable ex- 
tension of these later Tertiaries on the Solimées or Upper Amazon 
and Javary rivers in Brazil, ranging over an area 300 miles in 
length by 50 miles in breadth; again, the great extension westwards 
of the Atlantic, probably, as Mr. Brown believes, some 1500 miles 
west of the present shore-line and covering the area now the valley 
of the Amazon, is of sufficient interest to demand some notice of the 
Mollusca once occupying the now elevated sea-, estuarine, and fresh- 
water deposits. 
Mr. T. A. Conrad* and Dr. H. Woodward*+ have both described 
certain species of Mollusca from these Tertiary deposits, many of 
them being the same as those collected by Mr. Brown, thus pre- 
cluding other notice than reference to them in the volumes cited 
below. I am enabled to add and describe about fourteen new species 
or forms, or such as I cannot determine from the works of others. 
PLANTA, 
Cuara (seeds of). 
The only remains of this freshwater plant are some eight or ten 
seeds, smaller than those of our British Charas; nothing whatever 
can be determined as to the specific characters of the plant through 
the seeds. It is a widely distributed genus, occurring in stagnant, 
fresh, and brackish water. The Upper Eocene beds (Hempstead 
series) of Britain contain three species, and three occur in the Post- 
Pliocene series ; we should expect to find the remains of this plant in 
extensive marsh and shallow-lake districts. The habit of the plant 
tends to its preservation, owing to the amount of carbonate of lime 
secreted in the stems and nucule. About forty species are known, 
and about fourteen are British. : 
Loc. Canama, in the lignite bed. 
MoLLuvusca. 
LAMELLIBRANCHIATA. 
Dreissena acuta, Ether. (Pl. VII. fig. 1.) 
I give this a provisional name, first, because it is the only speci- 
men, and secondly, the Dreissene are so much alike that, without a 
* Amer. Journ. of Conch. vol. vi. p. 192, t. 10, 11 (1871). 
t Ann. & Mag. Nat. Hist. ser. 4, vol. vii. pp. 59, 101, t. 5 (1871). 
