WORMS FROM MAMMALS AXD BIRDS. 



501 



0*35 mm., the wider posterior region 8'8 mm. Tlie aims is sub- 

 termiiiaJ. 



Vulva 0'55-0-6 mm. from the oral extremity. The stout, 

 muscular vagina runs straight backwards, and has a length of 

 2^) mm. 



Oviparons. Eggs thick-shelled, 0-045-0-Or) x 0-035 mm., con- 

 taining well-developed embryos. 



Text-figure 9. 



Diplotricena dmccB, sp, n. 

 Latoval view of anterior exti-eniity of female, X 120, 

 Lettering as in the preceding text-figure. 



DiPLOTRIiENA DIUC^, Sp. n. 



This worm was obtained from the body-cavity of the Diuca 

 Finch, Diuca grisea ; the material included both male and female 

 specimens. 



Specific diagnosis. — Diplotricena: Body comparatively short, 

 semi-transparent, tapering at both ends. The anterior extremity 

 is narrower than the posterior. 



Cuticle thin, transversely ringed. 



Cephalic extremity with six very inconspicuous, flattened 

 papillae. 



Each a\sophageal trident has a length of 0-13-0'14 mm.; its 

 anterior stem terminates in a fine point. CEsophagus 2'5-4 mm. 

 long, narrow throughout, and without division into anterior and 

 posterior regions. The nerve-ring surrounds tlie esophagus 

 0*2 mm. from the anterior extremity. 



