NEPHROPS, 



These eight appendages complete the thorax. 



Still passing forwards on to the head we find two small 

 foliaceous viaxillce. The second maxilla (the first to be 

 removed) has a quadrifid 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. 



P^ig. 138.— A, First Maxilla, and B, Second Maxilla of 

 Nephrops. (Ad nat.) 



B 



Endopodite. 

 Epipodite. 



Quadrifid- 

 Protopodite 



Exopodite. 



Epipodite. 



The mouth is guarded by a pair of powerful biting 

 jaws, formed by the protopodite of the mandibles^ the little 

 endopodite being three-jointed and forming xh^ palp. Pass- 

 ing in front of the mouth we reach the large antennce. 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 



