Plate VIllIa. 
Fig. 1—Spiroptera Microstoma, 
(Cephalic extremity). 
Oral cavity. 
Pharynx. 
Oesophagus. 
d, Cuticular surface. 
Fig. 3—Spiroptera 
Megastoma. 
(Cephalic 
tremity). 
a, Oral cavity. 
b, Pharvmx. 
-, Oesophagus. 
ex= 
Fig. 2—Spiroptera 
Microstoma. 
(Caudal extrem- 
ity of male). 
a, Anus. 
b, Spiculae. 
ce, Transverse 
markings. 
Fig. 
Cervina, . 
a, Cephalic extrem- 
4—Filaria 
ity. 
b, Caudal extremity, 
