Bibliography. 399 
phitis Americana, or skunk, is found in both Americas, extending from 
the frozen regions of the northern, to Chili and Paraguay in the south- 
ern hemisphere. Lutra Canadensis and Braziliensis, which Dr. De Kay 
regards as identical species, there being no essential differences, extends 
over the immense tract of country lying between the Arctic seas and 
Brazil. ree i 
The number of extinct mammifers whose remains haye as yet been 
discovered within the limits of the state, is very small, and even these 
have been detected more abundantly elsewhere. The fossil elephant, 
E. primigenius, has been found in one locality only. The remains of 
the Mastodon giganteum, Cuvier, have been detected in several locali- 
ties; but since they haye not as yet been detected in Massachusetts or 
other eastern states, excepting ‘Connecticut, New York may be regard- 
ed as enclosing a portion of the eastern limit. 
The only other fossil mammiferous remains indicated by Dr. De Kay, 
are those of the fossil stag, Elaphus Americanus, which haye not been 
detected except in one or two instances. J. W. 
2. Monographies D’ Echinodermes Vivans et Fossiles; par Louis 
including what has been for the most part overlooked by previous nat- 
and Dysasters, by Desor; and the fourth, the anatomy of the Echini, 
by G. Valentin. Of the Scutella there are described thirtecn gentrs 
and seventy-four species, illustrated by twenty-five quarto plates, inclu- 
