APSEUDES. 147 
epimera of Milne Edwards, called also the pleura by 
many authors) existing as articulated appendages, demon- 
strating two important features in the homologies of 
these parts: first, that they are really portions of the 
appendages, being the first joint or coxe of the pleopoda, 
as first observed by Mr. Spence Bate in his report on the 
Amphipoda ; and second, that since the peduncle consists 
of three joints, the second branch in the appendages of 
the pleon, as in other parts, is shown to take place in- 
variably at the extremity of the third joint. 
Of this genus we regret that we have obtained but 
few specimens, too few, indeed, to have enabled us to 
make complete dissections of the animal. 
As yet we know not the form of the male animal ; 
it may be similar to that which we figure as the female, 
but had not Miller, Rathke, and Lilljeborg described the 
females of Tanais as resembling the male, we should have 
suggested that these species were females of Tanais, for 
it is a singular fact that although of the latter genus we 
have examined some hundreds of individuals, we have 
never yet seen one possessing the features of a female.* 
* We are bound, however, in this place to recall attention to Rathke’s 
figure of his Crosswrus vittatus with a large incubatory pouch filled with 
large eggs. 
