﻿IX, B. 6 Walker: Morphology of the Adults of Filaria 487 



preanal papillae, which are very small and difficult to distinguish 

 (Plate I, fig. 5). 



Table II. — External measurements of the male filaria. 



Millimeters. 



Length (exclusive of coiled tail) 33.0 

 Greatest thickness 0.126 



Diameter of head 0.0486 



Diameter of neck 0.0437 



Diameter of end of tail 0.034 



Distance from cloaca to end of tail 0.129 



Intestinal tract. — The mouth, as in the female, is terminal. It 

 opens into the long slender oesophagus of approximately uniform 

 diameter, which extends straight backward 1.23 millimeters. 

 It is slightly constricted at its junction with the mid-gut. The 

 intestine is slender, of approximately uniform diameter, and runs 

 nearly straight the whole length of the body of the worm. It 

 enters the cloaca which opens on the ventral side of the worm 

 at 0.129 millimeter from the posterior border of the curved tail. 



Reproductive organs. — The genital organs of the male consist 

 of an elongated testis which is continuous with the spermatic 

 duct and opens into the cloaca, the whole constituting a single 

 cylindrical organ running ventrally nearly the entire length of the 

 worm. The proximal end of the spermatic duct consists of a 

 narrow, muscular ductus ejaculatorius, opening into the cloaca. 

 The spermatic duct then becomes gradually dilated to form the 

 seminal vesicle, which is from one-third to one-half of the di- 

 ameter of the body cavity. This is continued into the slightly 

 more dilated, long cylindrical testis which almost completely fills 

 the body cavity and extends to within 1.7 millimeters of the an- 

 terior end, or to within 0.469 millimeter from the posterior end 

 of the oesophagus. The distal (anterior) end of the testis tapers 

 somewhat and terminates in a bluntly barbed end. The acces- 

 sory genital organs consist of 2 spicular sacks situated laterally 

 to the cloaca, containing spicules which are of unequal length 

 (Plate I, fig. 5). 



COMPARISON OF THE PHILIPPINE WITH OTHER ADULT FILARIA 



The complete measurements of the adult Philippine filaria and, 

 for comparison, the measurements, so far as they are given, of 

 the hitherto described species of human filaria are given in 

 Table III. 



