64 
T. Y. HODGSON. 
provided with a number of stiff setae. The eye-stalks are rather stout and in front of 
them ; on the margin of the cephalosome is a stout slightly curved spur. 
The surface of the cephalosome is sparingly covered with rather long setae. 
Of the mesosome the first segment is stout, the two following are subequal, but 
the third is the broadest, the fourth is a very little shorter and narrower than the 
preceding. All these have rounded epimera ; they are rather widely separated and in 
the first segment they are directed forwards so as to partially embrace the cephalosome. 
All are provided with long spinous setae, and the segments themselves are furnished 
with a transverse band of more delicate setae. 
The three posterior segments are curved posteriorly, their curvature increasing as 
their diameter decreases. The first of these segments carries a transverse row of setae, 
the other two bear two or three stouter ones more laterally. 
The metasome consists only of a single pentagonal plate, the angles of which are, 
however, rounded, and each of the three free ones bears a group of stout spinous seta 
similar to those on the epimera of the rest of the body. There are a few setae on 
the surface of this plate, centrally and anteriorly. 
The uropoda are very large and biramous. The protopodite is a single joint with 
a comparatively slender base and widening distally, the exo- and endopodite differ but 
little in size, the former is straight and provided on both sides with long stiff setae ; 
the latter is curved and only carries the setae on the outer side of the curve and 
distally. 
The first antenna is short, it comprises a peduncle of two joints subequal in length, 
but the proximal one is much shorter than the other, and fringed distally with stout 
spinous setae. The flagellum is about half as long again as the peduncle and consists 
of only four joints, the first two are short, the others are more than twice as long, the 
last being very slender and provided with two specialised setae. 
The second antenna has a peduncle of five joints ; of these the first three are very 
short and stout, the basal one having a long spine on its inner border and the third 
forms a characteristic bend in the appendage. The two terminal ones are long and 
slender, the advantage being with the more distal one; the flagellum is about as long 
as these two joints. 
The mouth parts are normal. 
The mandible is strong and the masticatory lobe terminates in four bilobed teeth, 
or, rather, two pairs, since one pair is larger than the other, the individuals of each 
pair being approximately subequal; below these are three slender teeth, having their 
upper margins produced into a serrated blade. The molar process is long and widens 
out distally into a plate-like structure, having anteriorly one prominent tooth and 
posteriorly several small tubercles. The palp is three-jointed, the first two joints are 
rather long, fringed on one side with very minute setae ; the third is a serrated spine 
less than half the length of the joint bearing it. 
The first maxilla comprises a short and slender inner lobe armed distally with 
