242 
REVISTA CHILENA DE HISTORIA NATURAL 
a NEW í5M?ttlP0T) 
FROM THE PACIFIC COAST OF SOUTH AMERICA 
B\ 
Alfred O. WALKER 
(Ulcombe, Kent) 
Elasiiiopns cliilensis, ii. sp. 
Differs from E. rapax Costa, as described by Prof. G. 
O. Sars, Crust, of Norway, Amphipoda, p. 521, pi. 183, only 
in the 2"'^ gnathopod of the male. In this the palm, which is 
about twice as long as the proxi- 
mal part of the hind margin and 
is defined by a rather strong 
tooth, is excavated, the sides 
forming 2 ridges. On the inner 
of these, near the hinge of the 
dactylusis a rounded lobe below 
which is a tooth similar to that 
which defines the palm. On the 
outer ridge, opposite to the 
lobe, is a very large tooth (*): 
Fig. 2S.-ElasTnopns chilensis,n. sp. this constitutes the sole distinc- 
(2Md i*nathopod of male) . , . • . r- 
^ tion between this species and E. 
rapax, but it is a conspicuous one. The females and young of 
the two species cannot be distinguished. 
(Many speciuiens in alcohol. Tocopilla & Arica, VI, 1912, Prof. 
G. E. Porter, coll.) 
Ulcombe Sep., 1913. 
(*) marked a in the ligures. 
