192 



Kev. T. R. R. Stebbing on the 



Synoptical Table of the Genera of the Family Halacaridas. 



A. Rostrum short, triangular; 



f Palpi lateral, separate 1. Rhombognathus, Trt. 



four joints in the palpi, 1 Pal • touching above the ros . 



which are short, conver- t \ ° 2 SlMO( , NATHIJS Trt . 



gent. [ 



--Only three joints in the palpi 3. Colobocebus, Trt. 



B. Rostrum elon^ 

 gate, not con 

 Btricted at its '^ 

 base, with the 

 palpi parallel. 



Four 



joints in'S 

 the palpi 



Palpi termi- , 

 nated by a > 4. Halacabus, Gosse. 

 simple point. 



Palpi termi- 

 nated by a \ Subg. Leptopsalis, Trt. 

 , double point. 



Joint 3 of palpi nearly as long) 5 A Lohm _ 



as joint 4. ( 



C Palpi lateral, widely separated, J 



appearing to be formed of I 6. Scaptognathits, Trt, 

 C. Rostrum much elongated, | only three joints. j 



constricted at its base, pyri-^ 



form. 



Palpi in contact above the ros- j 



trum, with four well-deve-;* 7. Leptognathus, Hodg 

 loped joints. 



XXVI. — The right Generic Names of some Amphipoda. 

 By the Rev. Thomas R. R. Stebbing, M.A. 



In the 'Annals and Magazine' for December 1868, Norman 

 defined a new genus Helleria, with Helleria coalita, n. sp., 

 for the type. By a slip either of the pen or of the press the 

 superior antennas were said to be with, instead of without 

 secondary appendage. That the superior antenna? were much 

 shorter than the inferior was made a generic character. 

 Earlier in the same year, 1868, as was subsequently pointed 

 out by Eaton, the name Helleria had been given by Ebner to 

 a genus of the Isopoda. The Amphipod genus, however, was 

 left with its name unaltered until 1887. In that year 

 E. Chevreux, having obtained specimens of both sexes of 

 Norman's species, renamed the genus Guernea, with a Latin 

 rendering of the original definition. In this he retained the 

 statement that the upper antennas have an accessory flagellum, 

 but omitted the character describing them as longer than the 

 lower antenna 1 , because he found that this did not apply to 



