8 A HISTORY OF RECENT CRUSTACEA 
not podophthalmous, and does not apply to others that 
are. Instead of Podophthalma or Decapéda, Burmeister 
proposed Thoracostraca. To this, however, the objections 
already urged against Thoracipoda will apply, with the 
additional one, that the word has a termination which had 
been already employed in two, and has since been em- 
ployed in the third and fourth of the higher groups. 
Some purists correct the word Edriophthalma, in accord- 
ance with its derivation, into Hedriophthalma. They may 
correct on the printed page, but who can guarantee that 
they will have their cherished aspirate pronounced ? 
The stalk-eyed Crustacea are portioned out into four 
sub-orders: 1. The Brachyara, or short-tails, such as the 
edible crab; 2. The Macrira, or long-tails, such as the 
common lobster, prawn, and shrimp; 38. The Schizopdda, 
or cleft-footed crustaceans, In certain points of structure 
so near to the prawns and shrimps that at least one author 
of eminence classes them among the Macrira; and 4. The 
Stomatopéda, with feet converging about the mouth, crea- 
tures abundant in some waters, but rare in those that 
wash the shores of Great Britain. A fifth sub-order, the 
Anomira, or irregular-tails, has long been accepted, but 
modern classification is disposed to distribute its members, 
which include the hermit crabs and others of very curious 
habits, between the Brachyira and the Macrira, from 
which they may be supposed to have respectively diverged, 
yet without losing all trace of family connection. 
The sessile-eyed Crustacea are at present divided into 
three sub-orders, the Cumacea, Isopdda, and Amphipéda. 
The Cumacea seem to have entirely escaped the notice of 
the ancients, and among the moderns an accurate know- 
ledge of their singular structure is not too widely diffused. 
One of the genera earliest brought into notice received the 
name of Cuma, a wave, and from this was formed the de- 
signation Cumacea for the whole sub-order, which is exclu- 
sively marine. The Amphipoda, which are common in 
fresh as well as in salt water, were so named by the French 
naturalist Latreille, as having feet extending in all direc- 
tions, their limbs at the same time having much diversity 
