496 



PROF. C. L. BOULEXGER ON FILARIIB 



Vulva 0*65-0*9 mm, from the anterior end. The long vagina 

 runs almost straight backwards. 



Ovoviviparous. Eggs thin-shelled, measuring 0*03 x 0*02 mm. 



Text-figure 4. 



sp/.- 



Acanthoclieilonema diacantlia (Molin). 



Posterior extremity of male, lateral view. X 225. 



c.a., caudal appendage; cl., cloaca; c.jj., caudal papilla; jpo., post-anal papilla; 



■pr., prcanal papilla; ip., long spicule; spi., short spicule. 



ACANTHOCHEILONEMA GRACILE (Rudolphi, 1819). 



Filaria gracilis is a common parasite of Monteys and has been 

 listed from more than twenty-five species, including both Old- 

 World and New- World forms. My material is derived from the 

 peritoneal cavities of the following sjiecies, all from the Society's 

 Gardeas : White-fronted Capuchin {Cebus hypoleucus), Smoky 

 Woolly Monkey {Lagothrix ivfmnata), Moustache Marmoset 

 [Leontocebits mystax), and Squirrel Monkey (Saimiris sciurea). 



The systematic position of this worm is somewhat uncertain. 

 Diesing, in his famous ' Revision der Nematoden ' (1860), placed 

 it in his genus DqMaloihema, a genus which is not only ill-defined, 

 but contains also widely sepai-ate forms from Birds and Reptiles. 

 In many of its characters, e.g., position in the host, structure of 

 head-papillse, oesophagus, caudal appendages, spicules, etc., Filaria 

 gracilis closely resembles certain species of Aca7ithocheiloiiema, and 

 I have decided to include it, at least provisionally, in this genus. 



Specific diagnosis. — Acanthocheilov^evia : Body filiform, very 

 elongated, much diminished in breadth posteriorly. Head 

 narrow, not separated from the body by a neck-like consti'iction. 



Cuticle with very fine transverse striations, only visible under 

 high magnifications. 



