32 T. V. HODGSON. 
The metasome comprises three or four segments and a urosome, a circumstance 
which does not seem to depend upon age. In many individuals of varied size, and 
therefore presumably of varied age, a short segment is to be seen between the 
backwardly projecting lobe of the epimera of the last segment of the mesosome. This 
segment is very often undeveloped or concealed. Another segment has a peculiar 
posterior border ; it passes across the mid-dorsal line and at some little distance from it 
it forms an angular projection backwards, and then on in a slightly sinuous line to the 
epimeron. Just outside the angular projection two lines pass forward in a crescentic 
manner to lose themselves after a short course. This proves the segment to be 
incompletely divided into three. 
The urosome is as long as the five posterior segments of the mesosome; it tapers 
posteriorly, and the lateral margin is inflected so that it terminates as a spout with an 
oblique orifice, and the pleopoda lie in a sort of pocket. The inflected margins are not 
fused distally, a narrow groove separates them. 
The uropoda are conspicuous but not very large, not reaching the extremity of the 
urosome. They arise from a notch near its anterior border and possess a stout 
protopodite ; the exopodite is much smaller than the endopodite, of which the inner 
half is much thickened; both are lanceolate in form. The endopodite is larger in 
proportion and somewhat more angular in some of the smaller specimens. 
The antenne are completely ventral in position, the first lies naturally in a groove 
between the cephalosome and the epistome. 
The first antenna has a very stout peduncle of three joints. The first is as long as 
the other two together, very stout and bent at the base; the second is equally stout 
but short; and the third is much more slender and a little longer; the flagellum 
consists of six joints. 
The second antenna is larger than the first and rises quite close to and underneath 
it; the peduncle is three-jointed, the three progressively increasing in length; the 
flagellum comprises eleven joints, each of which, except the first, has a couple of tufts 
of specialised setze on the ventral surface. 
The buccal mass is rather prominent, and the epistome is triangular in shape with 
a wide and shallow piece taken out of the base. 
The mandible is strong, curved and tapering, but with a sinuous margin; the 
cutting edge is reduced to a blunt point, bifid, to form two strong but short teeth; 
on the inner side and a short distance from this is a group of stout spines. The molar 
process is stout, rather long, and forms a broad cutting edge. 
There is a three-jointed palp, the first two joints of which are subequal, the third 
is shorter. The second has half-a-dozen strong spinous sete distally on its inner 
margin, and the third has a series beginning about one-third of its length, at first 
small, but the distal ones are very long. 
The first pair of maxille consists of two long slender lobes united at the base 
by a connecting piece; fully one-half of the inner lobe is imbedded in muscle; the 
