$4.00 per Year. 


40 cts. per Copy. 
| THE 
- AMERICAN 
NATURALIST 
A MONTHLY JOURNAL 
DEVOTED TO THE NATURAL SCIENCES 
IN THEIR WIDEST SENSE. 


Vol. XXIV. 
MAY, 1890. 
No. 281 _ - 


CONTENTS. = 
PAGE 
Ally HOMOLOGIES OF THE FINS OF FISHES, 
E. D. Cope, 
A ZOOLOGICAL RECONNOISSANCE IN GRAND MA 
: J. Walter prone 423 
ean OF AMERICAN ZOOLOGY, . . J. S. Kingsley, 439 
EROSIVE AGENTS IN THE ARID REGIONS, 
Rath S. Tarr, 455 
S 

—The rag ts mmg of the American Asso- 
-cation for the Sciences a e 2 660 




OTES. 
and Travels .—Col. Stanton’s Recent 
o 

p — 



S 
EE Rincon amigo of paran by Green 
ellow 
ine 

Water p aia of Penk Plants—The Char- 
ee ee Se ee ee ae AA d 
Podocnemididz—Note on the Genera H is and 
Rhinemys—The Genera of the ee i 
cal News: ERE. Gra ropods, i 
ia 7 
Emèry Ce Og Y 
eS aA U ea 


of the Scales and o Actinotrichia ed Teleosts, 
AAs ren ©. Ay 
icroscopy. p 
tation of Protoplasmic Moveme EE ATE 
Archeology and Ethnolo, The Use of the Phono- 
graph e Study of of the American 
Indians, fa a, . » ge 
PROCEEDINGS OF Resins Sccoennes, te 
Scien tiric NEWS eee ee ee 







PHILADELPHIA: 
FERRIS BROS., 
SIXTH AND ARCH STREETS 
PUBLISHERS 

