258 
GAMMARIDiE. 
AMPHIPODA. 
NATATORIA. 
GA MM A RIDES. 
Genus — CALLIOPE. 
Calliope. Leach, MS. Coll. Brit. Mus. Spence Bate, Cat. Amph. Brit. 
Mus. p. 148. White, Hist. Brit. Crust, p. 179. 
Generic character. Like Pherusa , except that at least the 
second pair of gnathopoda have the propodos largely developed. 
This genus, like the preceding, partakes, in a strong 
degree, of the more or less arbitrary character of the 
majority of generic divisions, differing from Pherusa 
in nothing but the relative proportions of one or 
both of the first two pairs of legs. Although to a cer- 
tain extent the separation is not natural, we con- 
sider that it will be found convenient to adopt Leach’s 
views in distinguishing the large-handed species from 
those in which the hands are uniformly very slender and 
feeble. Paramphithoe of Bruzelius (. Acanthosoma , Owen) 
and Ampliithonotus of Costa, have no stronger claims 
to generic distinction than Atylus , Pherusa , and Calliope , 
and by sinking them, we should link together in one 
genus some widely different forms, and so fall into a 
similar error with Costa and Stimpson, the former of 
whom united D examine spinosa (Amphitoe Marionis, Milne 
Edwards ), Pleustes panopla (Amphitoe panopla, Kroyer), 
and Atylus carinatus (Gammarus carinatus, Fabricius ), and 
the latter, also added Paramphithoe liystrix (Acanthosoma 
hystrix, Owen) in one genus under the name of Amphi- 
thonotus. 
