NEPHROPS. 211 
These eight appendages complete the thorax. 
Still passing forwards on to the head we find two small 
foliaceous maxzlle: The second maxilla (the first to be 
removed) has a guadrifid jaw-like protopodite, a thin 
unjointed endopodite and a scoop-shaped epipodite (called 
the scaphognathite). The exopodite may possibly be repre- 
sented by a small process. 
The first maxilla is the smallest of all the appendages. 
It has a bifid jaw or protopodite and a small unjointed 
endopodite. 
Fig. 138.—A, Frrst MaxILLa, AND B, SECOND MAXILLA OF 
Nepurops. (Ad nat.) 
B 
— 
Endopodite. 
i) Epipodite. 
aw.) 
ie 
Quadrifid# _ Exopodite. 
Protopodite c 
Protopodite. 
J 
Endopodite. 
Epipodite. 
The mouth is guarded by a pair of powerful biting 
jaws, formed by the protopodite of the mandddles, the little 
endopodite being three-jointed and forming the pal~. Pass- 
ing in front of the mouth we reach the large axtennae. On the 
ventral surface of the basal protopodite of these appendages 
is an aperture, the excretory pore. The endopodite is pro- 
duced into a long tactile feeler, and the exopodite forms a 
small semi-circular scale. The antennule has a small aper- 
ture in the protopodite leading to the otocyst. It has no 
exopodite, and the endopodite is formed into two fila- 
mentous feelers. 
If we now return to the swimmerets we find that they 
are not all alike. The first swimmeret has, in the female, 
only one “paddle” (or the endopodite, borne on a small 
protopodite), whereas, in the male, the protopodite alone 
