Nematode Genus Tanqua, R. Blanchard. 



225 



it becomes apparent that each lip has in reality only three 

 " teeth " on its anterior border. The anterior lobe of each 

 lip (ng. 1, L.), which carries the teeth, is twisted slightly to 

 one side, in such a way that its teeth can interlock with those 

 of the otlier lip. The teeth of each lip are, in fact, asym- 

 metrically disposed with regard to the longitudinal axis of 

 the animal. Tlie " teeth " are, in reality, folds of thickened 

 cuticle, and are shown in optical section in fig. 1. 



Von Linstow is, I think, in error in stating that the two 



Fiy-. 1. 



C.G. 



Tanqua tiara. Head of an example from Varamis exanthematicus. 

 C.G., cervical gland: L., lip. 



cervical glands on either side unite anteriorly to form a 

 common duct ; the duct of each gland appears to open sepa- 

 rately upon tlie anterior surface of one of tlie four striated 

 swellings at the base of the lips. 



Another point in which von Linstow's accourit seems 

 inaccurate is the number of papillae on the tail of tlie male. 

 He mentions and figures (1904) two preanal, one large 

 paranal, and three postanal pairs of papillae. In the speci- 

 mens which 1 have examined there are two additional pairs 



