Plate Villa. 



Pf,g. 1 — Spiropterji llierostonia. 



(Cephalic extieimty). 



a, Oral ca\iti 



b, Pharynx. 



c, Oesophag-us. 



d, Cuticular surface. 



Fis. 2 — Spiroptera 

 Mierostonia. 



(Caudal extrem- 

 ity of male). 



a. Anus. 



b, Spiculae. 



c, Transverse 

 markings. 



Fig. 3 — Spiroptera 

 Mej»a.stonia. 



(Cephalic ex- 

 tremity). 



a, Oral cavity. 



b, Pharynx. 



C-, Oesophagus. 



Fier. 4 — Filaria 

 Cervina. 



3; Cephalic extrem- 

 ity, 

 b, Caudal extremity. 



