THE EUPHAUSIID@ 261 
slender as they are, would not seem, it is said, ‘to be 
specially adapted for the usual ambulatory motion, but are 
more likely used for the purpose of seizing hold of any 
delicate submarine objects, as Hydroids or Crinoids, fixed 
at the sea bottom.’ In preserved specimens these limbs 
are geniculate between the third and fourth joints. Their 
fingers, though nearly straight, bend back against the 
spines of the preceding joints, and may thus be very 
efficiently prehensile. Dana’s specimen was obtained 
from the stomach of a penguin in the Antarctic, ocean, a 
habitat which gave little reason to suspect the actual dis- 
tribution of the species. According to the Challenger re- 
searches it ranges from Japan to the Southern Ocean 
and from the Southern Ocean to Nova Scotia, preferring 
depths between 1,000 and 2,000 fathoms, though descend- 
ing lower and mounting higher. It is presumed that the 
specimen snapped up by the penguin must have made an 
excursion to near the surface. 
Family 3.—Euphausiide. 
The carapace is rather small, not calcareous, firmly 
connected with the trunk dorsally, only the last segment 
being completely defined above. The first maxillipeds are 
pediform, elongate, with well-developed natatory exopod, 
the epipod rudimentary or wanting. The seven following 
pairs of appendages are generally uniform in structure, not 
effectively ambulatory, geniculate and densely setose, with- 
out any distinct finger, the hinder pairs more or less im- 
perfectly developed. The branchiz are podobranchie, 
wholly uncovered, digitiform-arborescent, the hinder pairs 
rather complex, sending off a branch beneath the trunk. 
The egg-pouch, when present, is under the hinder part of the 
trunk, single or double, not formed by marsupial plates. 
The pleopods are strongly developed in both sexes, natatory, 
with a secondary lobe on the inner branch; the first two 
pairs are sexually modified in the male. The telson is very 
slender, tapering to an acute point, and carrying two large 
spiniform slightly divergent appendages, affixed at some 
