14 
W. M. TATTERSALL. 
of the antennule of the ‘Challenger’ specimen and (Plate IV., Fig. 4) a sketch of 
the antennule of one of the ‘ Discovery ’ examples for comparison with those given 
by Stebbing (1900). This shows clearly, in my opinion, that all three specimens 
belong to one species, and that the absence of the spine on the third pleon segment 
of the ‘ Challenger ’ example is the result of accident or possibly an abnormality. 
The peculiar shape of the antennular lobe is practically the same in the ‘ Discovery ’ 
and c Challenger ’ individuals, and only differs from Stebbing’s types in degree, a 
result of more complete growth. 
The rostrum of E. vallentini is very like that of E. splendens, G-. 0. Sars, but is 
slightly longer, and the angle formed by its margins a little more acute. Sars may 
have been misled by the resemblance between the rostra of the two species, which 
caused him to overlook the marked differences which exist in the antennulse. Dr. 
Hansen has seen the ‘ Challenger ’ specimen referred to, and agrees with my 
interpretation of its specific identity. 
One of the ‘ Discovery ’ E. vallentini is a male, but unfortunately the copulatory 
apparatus on the first pleopods is considerably damaged, so that I am obliged to refer 
to the ‘ Challenger ’ example, which is likewise an adult male, for a description and 
figure of this apparatus (Plate IV., Fig. 6). The figure represents the inner lobe of 
the endopodite of the first pleopod of the male. This inner lobe bears internally two 
movable processes, the inner and more distal of which is feebly curved, slightly over¬ 
reaching the inner lobe and bifid at the tip. The external and more proximal of the 
two processes has the distal extremity greatly expanded, the expansion very much 
broader than long, oblique, and divided into two lobes, the more distal of which is the 
larger. On the under side of the expansion of the proximal process as viewed in the 
figure there is a small spine-like process. The inner lobe of the endopodite itself bears 
a strongly curved uncinus with a small secondary spine near the tip. 
Distribution. —Southern Pacific, between New Zealand and Chili (‘Challenger’); 
Falkland Islands [Stebbing). 
Euphausia, sp. 
Locality of capture. —Lat. 57° 25' 30" S., long. 151° 43' E., nineteen specimens, 
10-18 mm. 
On first looking over these specimens I identified them with Euphausia splendens, 
G. O. Sars (1885), a species which Hansen (1905 (2)) considers to be different from 
E. splendens, Dana, and which he has re-named E. lucens. Hansen, in the same 
paper, notes that E. splendens, G. O. Sars, has the first joint of the antennular 
peduncle without a leaflet, but distally produced above. Holt and Tattersall (1906 
(1)) have confirmed this statement by an examination of Sars’ type specimens of E. 
splendens, in which they found that in the female type the lobe is quite conspicuous 
both in lateral and dorsal view; while in the male type, which is considerably smaller 
than the female, the lobe is less developed, but still easily seen in lateral view. Sars 
