94 A:\IPHIPODA. 



Mr. A. 0. Walker re-examined the typos of Jassa pelagica 

 in the British Museum, and A. M. N. has satisfied himself 

 by the same means, and found them to be this species; a 

 conclusion, moreover, which is borne out by the figure which 

 Milne-Edwards gave of one of these same type specimens. 

 Bruzelins restricted the name Jassa to this species, and to, as 

 he thought, a second one, the Podocerus capillatus of Rathke, 

 with the character that the upper antennas were without 

 accessory appendage *; at the same time he removed the Jassa 

 which had an accessory appendage into the genus Podoceru*. 

 This last usage of Podocerus has been generally followed, but 

 cannot be used now (see observations further on under 

 PlatopMum). But Bruzelins having been the author who 

 restricted the genus Jassa, his application of the name must 

 be retained, while another name must be given for the Jassa 

 pulchella, Leach, which Bruzelins rejected from the genus. 

 Under these circumstances, Parajassa suggested by Stebbing 

 for the present species must become a synonym of Jassa; 

 and we have thus found it necessary to give a new name, 

 Bruzeliella^ for the species which Bruzelius rejected from, but 

 which Stebbing proposed to retain in, the genus Jassa. 



Of course all this has nothing to do with what Bate and 

 Westwood called Podocerus pelagicus, which we have before 

 seen is Bruzeliella falcata, ? . 



Bate obtained Jassa pelagica from trawlers off Plymouth, 

 and also had it sent to him, with their nests built in 

 Plumularia, from Polperro by Laughrin. 



ERICHTHONIUS DIFFORMIS (H. Milne-Edwards). 



1863. Dercotlioe difformis, Bate & Westwood, vol. i. p. 461, $. 



This is Cerapus longimanus of Boeck. 

 Plymouth (A. M. Jv.). 



ERICHTHONIUS ABDITUS (Templeton). 



This is Erichthonius Widens of Costa, and E. dijformis of 

 Delia Valle. Dercotlioe pimctatits of Milne-Edwards and 

 Bate has been by Sars ascribed to the female of this species. 

 In 1808, A. M. N. made it that sex of E. difformis, and it 

 perhaps might belong to either, but the form of the head 

 suggests the latter. 



Torbay (Stebbing)} Exmouth, Teignmouth Bay, Salcombe, 

 Plymouth (abundant), Polperro (A. M. N.}. 



* There is a secondary appendage, but so microscopic that it is not 

 easily detected (see Sars, pi. ccxiv. tigs, a ]'* and acc.ajyj.). 



