236 
BRITISH ENTOMOSTRACA. 
The cephalo- thoracic segment is furnished with two sty- 
liform appendages (t. XXIX, f. 1 a), instead of having 
the moveable beak of Anomalocera ; these very much re- 
semble antennae in appearance, and are described as such 
by Goodsir.* 
The antennae are very long and slender, being longer 
than the body of the animal, and composed of twenty-four 
articulations, the twenty-second and twenty-third are 
each provided with a long seta, pointed downwards and 
inwards. 
The antennules (f. 1 c) consist of two branches, arising 
from a common footstalk, and are of nearly equal 
length. The one is divided into two articulations, the 
first of which is the longest, and is furnished with a long 
seta at its extremity, the second having its extremity 
armed with a number of very long setae; the other consists 
of two articulations also, the first of which is considerably 
bent, flattened, and armed with eight long spines on its 
inner edge ; the second much shorter, and having two 
long setae on its inner edge, and three from the extremity. 
The eyes are two in number, but are exceedingly small. 
The mandibles (f. 1 b) consist, as in Anomalocera, 
of a strong plate, having a good many teeth on its inner 
extremity, the most external one being strong, and 
slightly curved ; and a palpiform branch arising from its 
upper surface, which is composed of two branches, rising 
from a common footstalk, one branch being divided into 
two articulations, and the other having only one. 
The first pair of foot-jaws (f. 1 d) resembles much 
the same organs in Anomalocera, consisting of a basilar 
joint, not so heart-shaped, with two other articulations, 
the last being very deeply notched, or lunate, instead 
of being cleft to the base, but all armed with long 
setae. The second (f. 1 e) is composed of two articu- 
lations, each of which is knobbed on its inner edge, 
and armed with twelve long, finely-plumose setae, those 
* Loc. cit. 
