C. F. Hartt—Tertiary Basin of the Marafion. 58 
mean distance of J oc eee So long as the cluster occupied but 
Ject to frequent perturbations by Jupiter. 
ArT. XIL— On the Tertiary Basin of the Marafion ; by Cu. FRED. 
Hartt, A.M. 
ON the 12th of December, 1867, Prof. James Orton of Vas- 
sar College, on his journey down the Marafion, or Peruvian 
Amazonas,* spent a few hours at Pebas, a little village on the 
several species of fossil shells, but strangely neglected to observe 
the mode of their occurrence. In announcing his discovery in 
this river is called by some writers the Amazon, Rio Amazon, Amazons or 
0 If one uses either 
8zon or Amazons there is no propriety in prefixing the Portuguese word Rio. 
bd is Rio a zona 
im it is commonly spoken of as o Amazonas or the Amazons. T have simply 
followed the rule of not attempting to translate South American names. The 
Who 
swe 
Mag. Nae Hist for J 1871, p. 6 
; ist. for Jan. and Feb. » p. 6 Se 
Od “rgpens Dese. of new fossil shells of the Rio Amazon, published in advance, 
, 1870, 
