338 The Rev. L. GuiLpiNG on some West Indian Crustacea. 
Atya. Leach Zool. Misc. 
1. Atya scabra. 
Atys scaber. Leach in Linn. Trans. ii. p. 345. 
I have only introduced this genus to take notice of the habitat 
of the species which was found unmarked in the British Museum, 
and which stands as the type. It occurs in incredible numbers 
in the mountain streams of this island in company with Palæmon 
Carcinus, where they are caught by the Negroes in baskets for 
the market. 
St. Vincent, August 1, 1823. 
XVIII. Ob- 
