Mr. C. Spence Bate on a new Genus of Macrara. 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 

 ])rimary 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 Eryonidas, 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 Eryonidte, although 

 there is nothing inconsistent with their presence in that 

 family. 



The Eryonidee, 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 {E. Cuvieri)^ possesses the re- 

 mains of a pair of biarticulate appendages which from position 



Eryon Cumeri, after Desmarest, with ophthalmi added in 

 dotted outline. 



and form can only be accepted as the pedicular bases of the 

 ophtlialmopoda ; and I believe in this sense they were under- 

 stood by Dr. Willemocs-Suhm when he wrote in his notes, 



