1922.] 



H. A. Baylis and R. Daubney : Parasitic Nematodes. 



315 



mm. in thickness. It is very slightly enlarged posteriorly. The nerve-ring surrounds 

 the oesophagus at about 0*13 mm. from the anterior end, while the excretory pore 

 opens at about 0*2 mm. from the head. The 

 posterior extremity is rounded and not notice- 

 ably attenuated. The anus is small and 

 subterminal. The vulva is situated close to 

 the head, at about 0*45 mm. from the anterior 

 end. There is a short transverse vagina, 

 directed slightly backwards, from which two 

 o vej ectors are given off. The uteri and ovaries 

 are both posterior, but a forwardly-directed 

 loop in the ovejector of one of them indicates 

 that this represents an anterior uterus. The 

 eggs in the uterus measure about 0*024 X 0*017 

 mm. , and are in various stages of segmentation. 



Henry and O'Zoux (1909) include F. abbreviata in 

 a list of species of the subgenus Diplolriaena. Walter 

 (1866) gives a description and figure of a worm from 

 Motacilla alba, which he regarded as F. abbreviata, but 

 these make it quite clear that his material belonged 

 to a species of Diplotriaena. He also describes and 

 figures as a Filariid under the name of F. (attenuata ?) , 

 from Corvus corone, Garrulus glandarius, ßaxicola 

 rubicola and Falco tinnunculus, a form which is clearly a 

 Diplotriaena ; and it seems not improbable that the 

 material in both of these instances was referable to D. 

 tricuspis, which is recorded from a very similar range 

 of hosts. It appears to us questionable whether the 

 original F. abbreviata was in reality a Diplotriaena. 



Fig. 50. — Filaria abbreviata (?). Anterior 

 end of female ; lateral view. 



b. } buccal cavity ; e., excretory pore ; n.r., 

 nerve-ring; v., vulva. 



" Filaria," sp. 

 A single specimen of a different species from those mentioned under F. haje 

 occurred in the intestine of a cobra. It is an immature form measuring about 20 

 mm. in length. The anterior end is broad and blunt,, the posterior end more taper- 

 ing. The oesophagus is relatively shorter than in "F. haje." 



Filaria macrophallos, Parona, 1889. 

 (Fig. 51.) 

 Hosts: Varanus salvator, V. flavescens, V. nebulosus, "Bengal monitor", 

 Varanus, sp. Position : from the labels it is not quite clear whether the habitat is 

 the actual cavities of the lungs, or the thoracic cavity. In three cases the lungs are 

 mentioned, in one no position is specified, and in two the " intestines " are mentioned. 

 Great difficulty was evidently experienced in collecting whole specimens of this 

 worm. We have only succeeded in finding one whole female among the material at 

 our disposal, the rest consisting of much-tangled fragments. 



