Mr. C. Spence Bate on a new Genus of Macrura, 73 
while demonstrating their powerless condition as prehensile 
organs, seem to argue that the animal is related to the lower 
type of the long-tailed forms, more especially to that group 
which is denominated Schizopods, if Professor Sars’s defini- 
tion of the presence of long and sweeping appendages be a 
primary feature of their character. But this point I have, I 
think, successfully shown, in the Report of the ‘ Challenger’ 
Macrura, to be a feature that is common with others and that 
it is not a condition peculiar to any group. 
If we examine the animal now before us in detail we 
shall find that the pereiopoda bear a characteristic resem- 
blance to those found in the Eryonide, but differ from them 
in the retention of the branches, features consistent with 
immature forms, but rarely present in the adult condition 
and never previously found among the Eryonide, although 
there is nothing inconsistent with their presence in that 
family. 
The Eryonide, looked at both in their fossil and recent con- 
dition, contain many forms which vary considerably in detail 
from each other and are more than specifically distinct. 
The fossil species which has been figured by Desmarest, and 
on which the family is founded (Z. Cuvierz), possesses the re- 
mains of a pair of biarticulate appendages which from position 
Evyon Cuviert, after Desmarest, with ophthalmi added in 
dotted outline. 
and form can only be accepted as the pedicular bases of the 
ophthalmopoda ; and J believe in this sense they were under- 
stood by Dr. Willemoes-Suhm when he wrote in his notes, 
