Charles Frederick Hartt. 
23 
[One of the latest contributions to geological literature, 
arising from the explorations of Prof. Hartt in Brazil, is a 
beautiful memoir on the Trilobites of Erere and Maecuni, by 
Dr. John M. Clarke of the State Museum at Albany, N. Y. 
This work has been published at Bio under the ausj^ices of 
the National Museum of Brazil, and shows very clearly the 
value of trilobites as guages of geological history. The 
brachiopodons shells from the sandstones of the two localities 
above named, described by Eichard Eathburn, synchronized 
the sandstones of those places with the IMiddle Devonian of 
New A^ork, etc. But a study of the trilobites of the two 
localities compels a modificaHon of this view ; for while the 
trilobites of Erere have a Middle Devonian aspect, those of 
Maecuni find their nearest relatives among the lowest Devonian 
species, or even with the trilobites of the upper part of the 
Silurian system. Dr. Clarke’s essay contains many profound 
generalizations on the relationship and descent of the species 
of trilobites of the genera Homalonotus, Phacops and Dal- 
manites. — C. F. M.] 
“Eichard Ratlihiirn, now of the Smithsonian Institution, was a 
member of the Brazilian Survey from 1875 until its work was suspended. 
He has published nine important papers upon the natural history of 
Brazil, — results of his work under Hartt. Frank D. Y. Carpenter 
published two works, one upon methods of geographic work and the 
other a popular book. Herbert H. Smith has published two books, one 
of which is the most important popular work that has appeared upon 
Brazil since that of Mrs. Agassiz. The writer has published twenty- 
one titles on Brazilian topics. But the publications of these five 
assistants do not represent the full extent of their work, for, with the 
exception of Mr. Carpenter, who died in 1883, these men are all active 
wmrkers, and many of the results of their observations in Brazil still 
remain to be published. 
Other papers, based upon collections made by Hartt and his 
assistants, have also been written by various authorities. The most 
important of these is Dr. C. A. White’s “ Contributions to the Paleon- 
tology of Brazil,” published in 1887, and beautifully illustrated. This 
work describes 315 species of mesozoic fossils collected by the Brazilian 
Survey. Otha* contributions are Marsh, Hyatt, Cope, Verrill, S. I. 
Smith and T. B. Comstock. 
But Hartt’s good influence has done even more for Brazil in keep- 
ing up the tone and character of scientific work than in the results thus 
