REVIEWS 
The Upper Silurian fauna of the Rio Trombetas, State of Parad, Brazil. 
By Joun M. CrarKke. Archivos do Museu Nacional do Rio de 
Janetro, 1897-1899, Vol. X, 1-48. Rio de Janeiro, 1899. 
Devonian mollusca of the State of Pard, Brazil. By Joun M. 
CLARKE, 7dem 49-174. 
These two papers are published in both English and Portuguese and 
are accompanied by eight beautifully drawn quarto plates, done by 
lithographers accustomed to work of this kind, illustrating all the 
species described. | 
The collections described are those made in 1876, in the Amazon 
valley, by the extinct ‘““Commissio Geologica” or Imperial Geological 
Survey of Brazil. When the survey was suspended in 1877 the col- 
lections were turned over to the National Museum at Rio de Janeiro, 
and through the efforts of Professor O. A. Derby, previously a member 
of the survey and later director of the geological section of the National 
Museum, these unique collections were placed in the hands of Dr. John 
M. Clarke, one of our best American paleontologists. Dr. Clarke had 
already described and figured the trilobites of the Ereré and Maecurti 
sandstone, his paper appearing in Vol. IX of these same archives. 
The papers here mentioned make his second important contribution to 
our knowledge of the paleontology of the Amazon valley, and the most 
valuable since the publication of Dr. C. A. White’s great work upon 
the Cretaceous fossils of Brazil. 
At the end of the second paper he gives a list of the Devonian 
species of the Lower Amazon region, and finds the Ereré fauna to be 
“a miniature of the Hamilton”’ of New York (p. 158). The Curua 
fauna he considers a member or modification of the Maecurti group. 
The rocks from which these fossils come are exceedingly rich, one 
locality, Ereré, furnishing forty-eight species, and, another, Maecurut, 
seventy-eight species. 
In his summary concerning the Silurian fossils Dr. Clarke says that 
“the lower and upper Silurian elements of this little fauna are pretty 
equally commingled, and the inference is quite natural that in this 
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