400 Dr. Leach’s Arrangement of the Crustacea, ^c. 
Gen. 14. Hydrachna, Mull., Latr. 
Palpi porrecti, appendice mobili instructi. 
Gen. 15. Limnochares, Latr. 
Palpi incurvati, simplices. 
Subclassis II. NOTOSTOMATA. 
To this subclass belongs the genus Nycteribia of Latreille 
and Montagu, which I suspect will be found to constitute two 
very distinct genera. 
XXXII. De- 
