1896.) Zoology. 675 
Central America 
Central American, . none east of the Cordillera. 
ge from West Florida to the Rio 
Mississippian, . 
. ppan, Mackenzie el system. 
Pa Missisippi Valley and the Gulf 
4 
f the North 
Great La 
Lower es we rence and rivers of eastern 
` Atlantic, anada. 
l Atlantic drainage of the United States. 
The Unios date back in America to the Trias, where they were first 
discoved by Prof. E. D. Cope. The relations of the existing Naiad 
fauna with the fossil forms is given by the author as follows: 
“The post-Cretaceous Unios of the northwestern States is evidently 
closely related to the fauna of the Mississippi Valley, and this seems to 
be related to that of Tropical Africa, as well as to the tertiary forms 
of eastern Europe and Siberia. The Unios of Australia and South 
America are apparently closely related to those of the Australian 
region. There seems to be, too, a general relationship between the 
Mutelide of Africa and South America. These Mutelids and the 
Unios which bear the embryos in the inner gills have perhaps formerly 
occupied extensive areas in the northern hemisphere, and may have 
been supplanted by more modern forms.” (Proceeds. U.S. Natl. Mus., 
Vol. XVIII, 1896.) 
Arkansas Fishes.—As the result of less than three weeks’ collect- 
ing in western Arkansas, eastern Indian Territory and the St. Francis 
River in northeastern Arkansas, Prof. Meek obtained 83 species of 
fishes. A new Notropis was found in the Potean River, and a new 
species of Fundulus is described from the St. Francis. Mollusks are 
abundant in old river, the old channel of the St. Francis. Six species 
of Unionide were found at a locality farther north than hitherto re- 
ported. (Bull. U. S. Fish Commission for 1895, Wash., 1896.) 
Batrachia and Reptilia ot Madagascar.—The two collections 
of reptiles from Madagascar, now in the Natural History Museum of 
Paris, have been examined by M. Mocquard, who reports upon them 
as follows: The Grandidier collection comprises 68 species in all, 
Ophidians 13, Bathrachians 20, of which 3 are new species belonging 
to the genera Mantidactylus, Rhacophorus and Calophrynus. Lacer- 
tilians 35, including 2 new species, referred to the genera Lygodactylus _ 
