LO A. O. WALKER. 
WALDECKIA OBESA. (PI. 2, fig. 4.) 
Waldeckia obesa, Chevreux. Expn. Antarctique Francaise (1906), p. 13. 
Charcotia obesa, Chevreux, Bull. Soc. Zool. de France, Vol. XXX. (1906), p. 168. 
W.Q., 17 May, 1902, two; 4 Oct., 1902, off Castle Rock (107), 3; 27 Aug., 1902, 
two (one adult male); 5 March, 1903 (159), one large, one young; 10 March, 1903 
(160), one large. 
Female, length 18 mm. 
Body tumid: First four side plates at least twice as deep as the segments, the 
fourth wider at the lower margin than deep, and greatly extended behind to the hind 
margin of the side plate of the third pereeopod ; this is large, convex, and subquadrate, 
widest below, angles rounded. The posterior angle of the first pleon segment is 
rounded ; that of the second acute ; the third has the hind margin elevated dorsally in 
a blunt tooth, the posterior angle upturned and sub-acute, the hind margin of the 
epimere hollowed out just above it, and thence convex. The first segment of the urus 
is carinate, the hind margin dorsally elevated in a recurved point. 
Head scarcely produced in front, a little longer than the first segment, speckled 
with red; ocular lobe produced to an acute point reaching to the end of the first joint 
of the upper antenne. yes large, dark, elongate-reniform. 
Upper antennz a little longer than the head, reaching the middle of the flagellum 
of the lower; first joint as lone as the flagellum, second very short, third almost 
covered by the second ; flagellum twelve-jointed, the first jomt longer than the next 
two, setose ; appendage seven-jointed, reaching beyond the middle of the flagellum. 
Lower antenne : The first jomt the shortest, the second the longest, curved and 
widening distally, the second and third together subequal to the twelve-joimted 
flagellum. In the male this reaches to the urus. 
Mandibles: Palp robust; first joint about half as long as the second, which is 
rather longer than the third, the anterior margin of which is convex for one-third its 
length, then straight and fringed with sete. 
First maxille as in Socarnes vahlii (Kroyer), except the inner plate, which has 
four or five unequal plumose setee. 
Epistome with both lobes rounded. 
Maaillipeds with the inner plates squarely truncate, with rather long setee on the 
ends and inner margins. 
First gnathopods » Side plates more than twice as deep as wide, oblong, with the 
front margin obtusely angulated near the insertion of the first joint, angles rounded. 
First joint wide, and as long as the remainder ; wrist shorter than the hand and wider 
than its base. The hand is simple (not subchelate), tapering to the base of the strong 
curved dactylus, and setose on the hind and distal half of the front margins. 
Second gnathopods: First joint fully as long as the remaining joints together ; 
wrist longer and rather narrower than the hand, the hind margin of which is a little 
produced ; dactylus distinct. 
