﻿ILLUSTRATIONS. 



[Photomicrographs by Mr. Charles Martin, photographer of Bureau of Science, Manila,] 



Plate I. 



Fig. 1. Female Necator americanus. (Original.) A, the vulva; B, the excretory 

 pore; G, the anus. 



2. Photomicrograph of female Necator americanus. Magnification, 14X1. 



A, excretory pore; B, vulva; G, anus. 



3. Male Necator americanus. (Original.) A, excretory pore; B, G, dorsal 



rays; D, one of the precaudal papillae. 



4. High magnification of the excretory pore, Necator americanus. 400X1. 



(Original.) 



Plate II. 



Fig. 1. Outline drawing of the tail of the male showing both precaudal papillae, 

 Necator americanus. (Original.) 



2. Tail of the male, Necator americanus. (Original.) A, dorsal rays; B, 



dorsal leaflets of the lateral lobes of the caudal bursa; G, one of the pre- 

 caudal papillae ; D, ventral enlargement of the caudal bursa; E, ventral 

 lobe of the caudal bursa. 



3. Illustration of the tail of the male Necator americanus showing the prin- 



cipal structures. (Original.) A, dorsal rays; B, dorso-lateral ray; G, 

 lateral rays; D, ventro-lateral rays; E, spicules; F, ventral rays; (I, 

 ventral lobe of the caudal bursa; H, precaudal papilla; /, ventral promi- 

 nence of caudal bursa. 



4. Photomicrograph of tail of male Necator americanus. Magnification, 



87X1. A, dorsal rays; B, precaudal papilla; D, the ventral lobe of 

 the caudal bursa; J, barbed tips of the spicules; K, dorsal leaflets of 

 lateral lobes of the caudal bursa; R, the ventral enlargement of the 

 caudal bursa adjacent to the precaudal papillae. 



Plate III. 



Fig. 1. Photomicrograph showing precaudal papillae of the specimen of Ne cato r 

 americanus given me by Dr. Garrison. Magnification, 10GX1. A, pre- 

 caudal papillae; B, ventral enlargement of the caudal bursa adjacent to 

 the papillae. 



2. Photomicrograph of male Necator americanus. Magnification, 10X1. 



3. Outline drawing showing the ventral lobe of the caudal bursa folded 



between the lateral lobes, Necator americanus. (Original.) 



4. Illustration of the tail of the male Necator americanus dorso-ventral posi- 



tion. A, dorsal rays; B, dorso-lateral rays; G, lateral rays; D, ven- 

 tro-lateral rays; E, ventral rays; F, spicules. The precaudal papilla' 

 are too delicate to be seen through the thick body. 



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