246 - Part ITI.—Nineteenth Annual Report 
abdomen are produced backward into distinct tooth-like processes. The 
caudal furca are moderately stout and rather longer than the last abdo- 
minal segment (fig. 1). 
The antennules are short and seven-jointed, and also moderately 
setiferous ; the first four joints are moderately large and tumid, but the 
last three are very small; the second joint is armed with a short conical 
tooth on its exterior aspect, and a stout and elongated plumose seta springs 
from the interior distal angle of the fourth joint (fig. 2). The formula 
shows the proportional lengths of the joints of the antennules :— 
Numbers of the joints, . : OAL 2 Fe 8 oe A ee es 
Proportional lengths of the joints,. 23 4. sian) 16 . 99 =. ae 
The antenne.—The primary branches of the antennez are three-jointed, 
the joints, which are sub-equal in length, are moderately elongated, a 
secondary four-jointed branch is articulated to the distal end of the first 
and is nearly equal to it in length; the last three joints of the secondary 
branches are small and their eutire length scarcely exceeds that of the 
preceding joint. Both branches of the antennze are provided with a 
number of plumose setz of moderate length (fig. 3). In Longtpedia and 
Canuella the antennee differ from those just described, not only in the 
character of the basal joiats and in the manner in which the secondary 
branches are hinged to them, but also in the secondary branches, in both 
being six- instead of four-jointed. 
The mandibles are moderately stout, sub-cylindrical, and truncate at the 
apex, each mandible is armed with several coarse apical teeth, and pro- 
vided with a well-developed two-branched palp ; the branches of the palp 
are supported on a slightly tumid basal joint ; the terminal branch appears 
to be uniarticulate, but the posterior branch is composed of about four 
joints, the three end ones of which are minute, both branches are mode- 
rately setiferous (fig. 4). | 
The maxille are each furnished with a distinct manducatory lobe 
armed with several moderately long and awl-shaped apical spines ; the 
palp is obscurely two-branched and turned toward the same side as the 
manducatory process, it is also furnished with a number of slender and 
moderately elongated setz (fig. 5). 
The first maxillipedes are robust and somewhat similar in structure to 
those of Canuella (fig. 6). 
The second maxillipedes are smaller than the first pair, and are 
apparently four-jointed ; the first joint is larger than the other three com- 
bined, but the third and fourth are very small. These maxillipedes are 
armed with several stout and spiniform marginal sete and two or three 
elongated spines, two spines at the end and on the inner aspect of the 
first joint have a fringe of minute hairs along the interior edge, while 
another at the end of the second joint is lancet-shaped, and has both 
margins of the distal half minutely serrated (fig. 7). 
The thoracic feet.—The first four pairs of thoracic feet are each com- 
posed of two branches, and both branches are three-jointed. The outer 
branches of the first pair are considerably more elongated than the inner 
branches, and they are also more robust, they are armed with moderately 
elongated, stout, and spiniform marginal and terminal setz; a single and 
somewhat slender plumose seta also springs from the inner margin of each 
of the three joints of the outer branches, as shown in the figure (fig. 8). 
The inner branches are not much more than half the length of the outer 
ones, they are composed of three subequal and sparingly setiferous joints ; 
the inner distal angles of the first and second joints are continued into 
