﻿486 ^^6 Philippine Journal of Science 1914 



gradually enlarges until it occupies almost the entire body cavity. 

 In these specimens the enlarged posterior part is filled with 

 young larvae. » 



The posterior, enlarged, end of the vagina branches to form 

 the two uteri (Plate I, fig. 4), which extend side by side straight 

 backward nearly the whole length of the worm, occupying the 

 entire body cavity except for the slender intestine; they are 

 filled with larvae and ova containing larvae. At a distance of 

 from 5.9 to 11.6 millimeters from the posterior end of the worm 

 the uteri become abruptly contracted to be continued as the 

 slender ovaries. The uteri do not always become constricted 

 to form the ovaries at the same point. Thus in female No. 2, 

 one uterus gives rise to the ovary at 8.4 millimeters and the 

 other at 11.5 millimeters from the posterior end of the worm. 



The two ovaries form one or two loops upon themselves, and 

 extend to within from 4.8 to 1.4 millimeters of the posterior end of 

 the worm. The anterior part of the ovaries are empty tubes, 

 but the posterior, distal, ends are filled with partially developed 

 ova and undifferentiated protoplasm. 



The ovum is oval in outline, and contains the immature larva. 

 The ova measure from 45 to 47 microns in length and from 27 to 

 29 microns in breadth. 



The free intrauterine larvae (immature) measure from 213 

 to 233 microns in length, exclusive of the sheath, and from 4.7 

 to 5.8 microns in breadth. The larva is inclosed in a sheath 

 which extends beyond the caudal and cephalic ends and which is 

 sufficiently loose to permit of forward and backward movements 

 of the larva within it. The tail of the larva is tapering and 

 pointed. 



II. THE HALE 



General. — The male is shorter and slenderer than the female 

 filaria. It tapers slightly at both the anterior and posterior ends. 

 The tapering anterior end is slightly enlarged into a bulbous 

 head, which is flattened anteroposteriorly (Plate I, fig. 4) and 

 bears laterally 2 rows of papillae that are even more minute 

 than in the female. The posterior end is spirally coiled two and 

 one-half to three times (Plate I, fig. 5). There are no apparent 

 lateral lines. The male shows transverse striations of the cu- 

 ticle much less distinctly than the female ; in fact, the striations 

 are apparent only at certain curves of the coiled tail. There 

 are 3 pairs of postanal and numerous pairs — at least 32 — of 



