COPEPODA. 
43 
more.than one quarter as long as Ri 1. Re 1 elongated and seven or eight times as 
long as broad. 
Anterior foot jaws with a rather stout, but unarmed hook on the fifth lobe, not 
longer, however, than the other bristles. 
Posterior foot jaws thick, with Ri of similar thickness to B 2, and of five 
segments; the five stout curved hook bristles of nearly equal length, the two terminal 
only a little the longest and thickest. 
Mandibles with Ri very long and Re only as long as Ri 1 ; masticatory plate with 
outer stout, broad-based, conical and curved tooth ; three pointed short teeth internal 
to it, rather like II. mucronatus. 
Maxillae.—First inner lobe with six bristles, of which only two of the distal ones 
are stout hooks ; second inner lobe with one stout long bristle ; third inner lobe with 
one stout elongated and two short thin bristles ; B 2 about as broad as long, with four 
elongated and thick bristles and one thin, short proximal bristle, Ri longer than broad, 
and about three-quarters as long as B 2 and only half its width, and with five bristles ; 
Re very long, twice as long as Ri + B 2, and nearly twice as long as broad, with eleven 
bristles, of which the three innermost are short and thin. 
All feet with three jointed rami, Re of fifth pair only five-sevenths as long as Re 
of fourth pair; Ri of fifth pair only as long as Re 1 + 2 ; Re 3 longer than Re 1+2, 
twice as long as broad, with three inner bristles, two outer spines, and end spine nearly 
as long as the last segment. I have not yet seen the i of this species. 
OITHONA (Baird). 
Two species of this genus occur in these collections, one of which, viz., Oithona 
similis, is of world-wide distribution, and occurs with great frequency in Antarctic 
collections ; the other, to which the name Oithona frigida has been given by 
Giesbrecht (and which has been fully described by him in the ‘ Belgica ’ report, vide 
ante), occurs very sparingly in the ‘ Discovery ’ collection. 
HARPACTICUS (Dana). 
Harpacticus furcifer. 
Harpacticus furcifer, Giesbrecht, ‘ Belgica ’ Report, p. 37. 
The ? of this species was first described by Giesbrecht in the ‘ Belgica ’ report; 
and in the ‘Discovery’ collection, marked 4. i. 02. W.Q., occurred three specimens of 
the male, though female examples were conspicuously absent. 
The ?, according to Giesbrecht, is F55 mm. long; the rostrum small, the 
series of points on the abdominal segments not numerous, the furca as long as both last 
abdominal segments, narrowing distally and about three times as long as broad; the 
VOL. IV. 
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