ZOOLOGICAL AND BOTANICAL ASSOCIATION. 201 



DESCRIPTION OF PLATE XIX. 



No. 1. — A. Platyarthru8 Hoffmannseggii, much enlarged. 



By details of under side of head ; a, frontal ring ; b, suture ; c, external 

 antennary plate ; d, lateral lobes ; e, internal antennary plate. 



b, abdominal rings & , showing absence of coxae in first and second 

 rings. 



b'y under view of telson, showing attachment of posterior pleiopod. 



d, d, back and lateral view of posterior pleiopods. 



e, internal antennae. 



No 2. — A. Lucasiu* myrmecophilus, enlarged. 



a } back view of head ; b t telson ; c, external antenna) ; d, posterior 

 pleiopod ; e, internal antennae. 



No. 3. — Trichoniscus. 



a, back view of head ; b, last abdominal ring, telson, and appendages ; 



c, external antennas ; d, posterior pleiopods. 



No. 4. — Acanthoniscus spiniger. 



b, telson ; d t posterior pleiopod. 



No. 5. — Ourachcerm caudatu*. 



a, head; b, telson; c, fourth and fifth joint and tige of external an- 

 tenna) ; dy posterior pleiopods. 



No. 6.—Deto Whitei. 



Cy fourth and fifth joint and tige of external antennae ; d, d, front and 

 back view of posterior pleiopods. 



No. 7. — Pyrgoni8cu8 cinctutus. 

 Ay head and first ring ; a, back view of head, showing frontal lobes ; 



a', under view of head, showing — (1) lateral lobes, and (T) frontal 



lobes and external antennae. 

 by telson and posterior pleiopods. 

 d y d, frontal and back view of posterior pleiopods. 

 /, under view of coxae of cephalothoracic ring, showing transverse ring 



and process. 



