PLATE XIX. 



Willemcesia leptodactyla (p. 163). 



c. Cephalon, dorsal aspect. Large variety; enlarged (p. 169). 



c". Cephalon, dorsal aspect. Type specimen. 



c"'. Inferior aspect of the anterior extremity of cephalon, showing first and second pairs 

 of antennae, siagon, third pair of siagnopoda, and first pair of gnathopoda, all 

 in position. 



c"". Metope or facial region, showing ophthalmopoda (a, a), position of first pair of 

 antennae (b,b), position of second pair of antennae (c,e). 



b. Coxa of first antenna with ophthalmopod («), in position. 



b. The same enlarged, having upper surface partially removed to show the internal 



structure of the auditory apparatus (ac). 



c. Second antenna ; view from the upper surface, showing the reversed position of the 



extremity of the phymacerite (ot). 



o. Posterior pair of pereiopoda of male, showing the foramen in the coxa for the 

 passage of the vas deferens. 



]>, $ . First pleopod of male, in relative position. 



q, $ . Second pleopod of male, showing two stylamblydes. 



q, ?. Second pleopod in female, showing one stylamblys. 



p. Pleon ; lateral view. 



pic. Internal dental apparatus at the pyloric extremity of stomach. 



