in the Crustacea Amphipoda, 



117 



briefly mentioned in tlie reports on the collections concerned ; 

 but a separate and somewhat fuller account seems desirable. 

 Both examples occur in species belonging to the family 

 Talitridse, Stebbing ( = Orchestid?e, auctorum) — namely, 

 Orchestia chiliensis, Milne-Edwards, and Hyale hrevipes, 

 Olievreux, and in both cases it is the second or lower 

 antenna that is abnormal. 



In Orchestia chiliensis the normal second antenna is 



Fig-, a. 



Hyale brevipes, Clievreux. 



Fig. 2. — Second antenna, with abnormal appendage arising from fourth 



joint of peduncle. 

 Fig. 2 a. — The appendage more highly magnified. 



generally considered to contain five joints in the peduncle, 

 the first and second being small and more or less fused with 

 the head, the third distinct but short, and the fourth and 

 fifth more elongated and generally subequal, the fifth being 

 followed by the multiarticulate flagellum. The abnormal 

 antennse were met with in a specimen of this species from 



