289 
Guppy Reprint 
141 
of South America. The African Shell figured under the name of 
Margaritana pfeifferiana by Bernard! (Journal de Conch, i860, 
PI. xii, F. I, 2) bears much likeness to the species named, which 
are all closely related. 
Cyrena semistriaia, Desk. 
I had attached the MS. name of craigiana to this Shell ; but 
a closer comparison of the numerous specimens contained in a 
Slab presented bj" Mr. Craig to the Victoria Mu.seum caused me 
to feel doubtful whether it ought to be accounted distinct from 
the C. semistriaia of the European tertiaries (Pictet, Paleontol- 
ogie, PI. Ixxvd, Fig. 10 ; and Forbes. Isle of Wight, PI. iii, F. 
2). It is akin to C. solida Phil, of Central American Rivers. 
5. There is also a verj’ remarkable Bivalve whose fragment- 
ary condition prevents determination. 
The collection indicates fluviatile or estuarine conditions and 
has resemblances to the tertiarj’ deposits of the Amazon’s valley 
Page 1 15 
who.se Fauna has been described by Conrad (Anier. Journ. Conch. 
1870) and Woodward (Ann. & Mag. N. H, 1871.) I am of opin- 
ion that a pliocene age is denoted. 
Note. — In addition to the papers referred to by Woodward 
in the place above cited there is a paper bj- Etheridge in the 
Journal of the Geological Society of London, 1879, P. 82 on Fos- 
•sils collected by Barington Brown in the Amazon’s valley. 
