﻿342 ILLUSTRATIONS. 



Plate IV. 



Fig. 1. Photomicrograph of tail of male Xecator americanus, postero-ventrally. 

 The same specimen illustrated by drawing. Magnification, 56X1. 



2. Illustration of ten uncinaria ova in different stages of segmentation with 



their respective measurements. (Original.) . 1, 72X40 /i; 2, 62X38 /i ; 

 .3. 58X42 ix; .',, 73X42 fi; 5, 58X43 n; 6, 68X36 /j. ; ~, 68X38 ^: 8, 

 62X38 /i; 9, 68X38 n; 10, 62X42 p. 



3. Photomicrograph of buccal plates in mouth of Xecator americanus. Mag- 



nification, 46X1. .4, large ventral plates; B, dorsal plates. 



4. Tail of the female greatly enlarged, Xecator americanus. (Original.) A, 



anus. 



