AMPHIPODA. 
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Group — NORM ALIA. 
This group comprises the typical Amphipoda, and in- 
cludes tlie whole of the order except those forms which 
have some of the appendages absent, or have the first 
joint of the legs absorbed into the body of the animal. 
It is synonymous with the order of Amphipoda of 
Latreille, Milne-Ed wards, & c., and is separated into two 
divisions — namely, Gammarina and Hyperina. 
Division — GAMMARINA. 
Distinguished from tbe other division of the group by 
the smallness of the eyes, the normal form of the antennae, 
the size of the foot-jaws, and the largeness of the squa- 
miform plates of the legs. This division corresponds 
with Milne-Edwards’s family of Crevettines, and also 
with that of Gammaridea of Dana. It is subdivided 
into Vagantia and Domicola. 
Subdivision — Vagantia. 
The Vagantia have always the inferior antennae ter- 
minating in a flexible multiarticulate flagellum, and the 
posterior pair of caudal appendages are fringed with fine 
hairs or short spines, and are never furnished with hooks. 
They construct no abodes to dwell in, but wander from 
place to place, swimming or walking in the sea, and 
hopping or wriggling along upon their sides on land. 
This subdivision represents Milne-Edwards’s tribe of 
Sauteurs. It consists of the two tribes Saltatoria 
and Natatoria, each consisting of a. single family. 
Tribe — S altatoria. 
In this tribe the posterior caudal appendages are never 
longer than the two preceding pairs. The hairs upon the 
