﻿ILLUSTRATIONS 



Plate I 



(The figrures in Plate I, with the exception of fis- 2, were all drawn with a Zeiss AA objective, 

 8 ocular, and tube lengrth of 160 millimeters, and with the aid of a camera lucida. Fig. 2 

 was made with a Zeiss DD objective. The figures are all reduced to one-fourth size of 

 drawings. The drawings are somewhat diagrammatic in order to bring out clearly the 

 essential structures. Drawn by T. S. Espinosa.) 



Fig. 1. Cephalic end of female of Filaria bancrofti, showing the anterior 

 portions of the alimentary tract and generative organs. 



2. Cephalic end of the female of Filaria bancrofti, more highly mag- 



nified, showing the details of the structure of the head. 



3. Caudal end of the female of Filaria bancrofti. Note the position 



of the anus and the absence of anal papillae. 



4. Cephalic end of the male of Filaria bancrofti. Note the constriction 



of the alimentary tract at the junction of the oesophagus with 

 the mid-gut. 



5. Caudal end of the male of Filaria bancrofti. Note the tendril- 



like coiling of the tail, the three postanal and the numerous 

 minute preanal papillae, the spermatic duct (dorsal) and the 

 intestine (ventral) opening into the slightly dilated cloaca, the 

 opening of the cloaca, and the extended spicule (the other shorter 

 spicule lies under the one shown in the figure) . 



491 



