240 Mr. R. Gurney on 
second joint is small, bearing five sete, of which the outer- 
most and the outer apical seta are smooth. This leg exactly 
resembles that of A. rapiens, except that the outer apical 
seta is longer than the second outer seta. 
Length *6 mm. 
Colour in lifea bright orange-red, due to numerous orange- 
red fat-globules. 
Male.—Shape as in female, but distinguished by its very 
much smaller size and larger eye. The last four segments of 
the abdomen have an unbroken row of spines ventrally, but 
the dorsal surface of the segments is unarmed. Anal oper- 
culum with about six small spines. Furcal rami as in the 
female, but somewhat more constricted distally. 
Fig. 3. 
Mesochra estuarii, sp. n. 
1, Fifth foot of female, 
2. Fifth foot of male. 
The swimming-legs do not differ from those of the female 
except In respect of the third pair. In this leg the inner 
branch consists of three joints, the second joint bearing a 
stout curved spine somewhat longer than the third joint 
while the third joint bears two subequal sete. The external 
branch is not modified. In the fourth leg the inner branch 
bears only three setee instead of four as in the female. 
The fifth legs have the basal joint not produced to the 
extremity of the second joint, and bearing three strong spines 
of nearly equal length. The second joint is quadrate, with 
six sete, of which the three inner ones are ciliated, 
Length °33 mm, 
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