438 



Gen. 3. Apherusa, AValker, 1891. 



Syn.: Pherusa, Sp. Bate (part). 



> Atyliis, Sp. Bate (part). 



> I'aramphithoe, Bnizel., (part). 

 ■> Halirages, Boeck (part). 



» Calliopius, Boeck (part). 



General form of body about as in Halirafjes, dorsal projections present 

 or wanting, f'eplialon with the postantennal corner.s more or less produced. 

 Coxal plates of moderate size, and succe.ssively increasing to the 4th pair, 

 which is the largest, and more or less emarginated posteriorly. Antennae 

 without any trace of calceolse, and rather unequal in length, the superior 

 ones being much shorter than the inferior, and having the last joint of the 

 peduncle simple, not forming any terminal expansion. Mandibles rather 

 strong, but having the palp not nearly so largely developed as in Halirages, 

 its terminal joint being much shorter than the 2nd. Maxillipeds likewise 

 with far less strong palps. Gnathopoda subeqiial and, as a rule, small and 

 feeble, with the propodos oblong in form. Pereiopoda of the usual structure. 

 Last pair of uropoda more or less projecting beyond the other.s, and having 

 the rami lanceolate and spinous on the edges. Telson of moderate size and 

 withotit any cleft. 



Eemarlcs. — The present genus is very nearly allied to Halirages, 

 and its validity may therefore perhaps be questioned. There are, however, 

 as shown by the above diagnosis, to be found some points of ditferenee in 

 the structure of the antennae and the oral parts, which seem to be of generic 

 value. As, moreover, several species may be most conveniently grouped in 

 each of these genera, I find it suitable to keep both apart. As to the generic 

 name Apherusa, it has recently been proposed by Mr. A. Walker to replace 

 that of Phertisa Leach, the latter being inadmissible, since the species upon 

 which Leach founded his genus has turned out to be only the female of 

 GammarcUa hrevicandata. The species to which Mr. Walker applied the 

 generic name Apherusa., is that described below as A. Jurinii, which, in 

 my opinion, is congeneric with the 4 other species here included in the 



