118 On Crassicauda crassicauda {CirpJ.) atid its flosfs. 



tlie body. TIic expression " noilulis expcrte" would appear 

 to mean that Creplin did not observe any circumoral papilb-p. 

 1 have, liowever, satisfied myself that these are present, and 

 have a definite arranrjement. On eitlier side of the nioutli, 

 situated in the middle of its length and very close to its 

 inartrin, there is a small rounded papilla. Laterally to this 

 there are, towards each side of the extremity of the liead, 

 three more jiapilla?, considerably larger than those first 

 mentioned. There are thus four pairs of papillse in all. The 

 .six outer papilla) are mastoid in shape and but slightly raised 

 above the general surface of the cuticle. Those of the middle 

 pair project in a ibrward direction, while the other^ four 



01 mm. 

 Head-end of Craxgicauda crassicauda (Crepl.). 



])apill?e, represent in fT, as it were, the corners of a square, are 

 more laterally directed. 



It will be .«een that the general appearance of the mouth 

 and [lapillae is very Filaria~V\ke. Except for a difference in 

 the number of the outer papilla?, there is a close resemblance, 

 lor example, to the arrangement seen in Filar ia horrida*. 

 Although, as Leiper and Atkinson have pointed outf, tiiere 

 is reasonable ground for separating this species from the 

 genus Filaria, sensii stricto, yet the characters of the month 

 and papillai, as exhibited by the present example, seem to 

 indicate a very close relationship to that genus. 



* See Schneider, * Monographie der Nematoden," pi. v. fig. 17. 

 t L. c. pp. 29-30. 



