872 The American Naturatist. [October,. 
Distribution : New Caledonia. 
?5. Atya robusta A. Milne-Edwards, 1864. 
Distribution : New Caledonia. 
6. Atya scabra Leach, 1815. 
Distribution: Fresh-water of Central America and the 
West Indies and the Cape Verde Islands——Mexico ; Nicaragua ; 
Cuba; Hayti; Jamaica; Dominica; Martinique; Tobago.— 
Cape Verde Islands; San Nicolao; San Jagoo. 
7. Atya gabonensis Giebel, 1875. 
Distribution: Gaboon ; Orinoco. 
8. Atya crassa Smith, 1871. 
Distribution: Nicaragua; Mexico: Presidio. 
I have to thank my friend, Dr. Ortmann, for calling my at- 
tention to this paper. I make the following quotations from 
it: “Some species of Atyidæ were formerly considered to be marine 
animals; there is now no doubt that this family contains only 
fresh-water forms. This family is probably one of the most prem- 
itive groups of Decapods living in fresh-water, having immigrated 
at an early geological period.” (Italics are mine). 
“ The geographical range of the Atyide embraces the whole 
of the circum-tropical parts of the world, members of the fam- 
ily being recorded from all the localities explored within these 
limits. Only in two localities does the range exceed the true 
tropics; in Japan, where it extends as far north as Tokio, and 
in the Mediterranean province, where it extends northward to- 
Southern France and Southern Austria.” The description by 
Kingsley of Cuaradina pasadene from Pasadena, California, 
since Ortmann wrote these words hardly makes necessary & 
modification in them, for Southern California is sub-tropical 
in its temperature. (Kingsley). ee 
“ The most primitive genus, Hiphocaris, shows a distribution 
the peculiarity of which can only be understood by supposing 
that the range of this genus was formerly a more extende 
one, but that in most parts of the world the representatives 
were exterminated. Only three species survived, one of which 
lives now in the fresh-waters of the West Indies, the other in 
Indo-Malaysia, from Japan to Australia, and the third in New 
Zealand. The closely allied genus Troglocaris, the only spe- 
