360 
GAMMARIDiE. 
This genus was founded by Rathke upon an Amphi- 
pod taken at Balaklava, which we have not seen, but 
which, from his description and figure, agrees so closely 
with A. Sabinii of Leach, that we should certainly have 
considered them as identical had not Rathke * stated 
that they were distinct. 
The animals of this genus are essentially Arctic ; both 
the number of species and the size of individuals de- 
creasing as they progress southwards. The Crimean 
species of Rathke is, however, as large as those of 
the polar regions. 
A specimen labelled Gammarus dentatus , in the Museum 
of the Jardin des Plantes, also so closely resembles 
Leach’s species that we should have associated them had 
not Pondicherry been recorded as the habitat of the 
former. 
Nova Acta Acad. Leopold, Nat. Curios, xx. p. 71. 
