9 9 
T. Y. HODGSON. 
appendage are all very short and broad and thickly bordered on both sides with long 
simple setee, some of which on the inner margins of the last two joints are distinctly 
spinous. The third and fourth joints are much expanded internally, and the fifth 
is a very broad stumpy joint. The second joint has short stout setse on its distal 
margin. The epignath is a very small rounded plate external to the basal joint. 
The pleopoda are approximately uniform in structure. The first has been 
removed for examination. The protopodite is short and broad; its external margin 
projects as a short, stout backwardly directed process, the inner margin is rounded 
and bears a dense fringe of short plumose setse, among which are a number of spines. 
The exopodite is a pointed egg-shaped structure, attached near the point ; its 
external and distal margins are densely fringed with rather long plumose setse. 
The endopodite is directed inwards from its attachment and then bent at a right 
angle, the anterior and inner edges being thickened and straight; they are fringed 
with fine setse, which ultimately become long and plumose around the distal third of 
the joint. The inner edge is rounded. 
The pereiopoda are all very much alike. In the first (fig. 5) appendage the 
basis is the largest joint and rather scantily fringed with long setse along its dorsal 
margin. This fringe is double, that is to say, dorso-lateral. A strongly developed 
distal fringe occurs ventrally, the ischium is a short joint and its dorsal margin 
projects as a shield over the next joint for some distance; this shield is fringed with 
long setse ; a row of setse occurs along the side of the joint near its end; a group 
occurs about the mid-ventral region and a row occupies the more distal portion ; the 
rnerus is very short if measured along its ventral margin, but dorsally it projects 
quite to the middle of the propodus ; this projection bears numerous long setse ; the 
ventral margin bears some four or five strongly developed spines and several 
weaker ones of irregular size. The carpus is quite a small joint, roughly triangular 
in shape, the distal half of its ventral margin is fringed with spines, which increase 
in strength and size distally, the dorsal margin is reduced to a minimum; the 
propodus is stout, slightly curved, with four spines ventrally. The dactylus is 
strongly developed, more than half the length of the propodus. 
The other appendages are built on exactly the same plan, differing only in the 
strength and abundance of the spinous or setose armature. The four anterior pairs 
conform most distinctly to this type ; in the remaining three the propodus is longer 
and more slender and the dactylus shorter. 
The dorso-lateral fringes of setse on the bases of the more posterior appendages 
become very strongly developed. The sixth appendage is typical of the other extreme 
of variation (fig. 6). The basis has two dense dorso-lateral fringes of plumose setse, 
a few arise ventrally just beyond the middle of its length, while distally they form a 
dense tuft. The ischium is articulated at the dorsal angle of the basis ; it is rather 
more than half its length, and the so-called dorsal shield projects but very little— 
it is scarcely prominent—the rnerus is two-thirds the length of the ischium, and the 
