Nematode Genus Taiiqiia, /?. Dlanchard, 



227 



TIio spicules of tlie inalo are cliaructeriiied by a peculiar 

 ra.sp-liko covering of minute points or spinelets tlirougljout 

 their length — a fact which the previous observers have 

 omitted to mention. 



Ill other respects the specimens which I assign to this 

 species agree well with von Linstow^s account (190-1). A 

 table, showing in parallel series the measurements of certain 

 jiarts of the body in the various sets of specimens studied 

 andj for comj)ari.son, the measurements given by von Linstow, 

 will be found on p. 231. 



Fijr. 3. 



Tanqua diadema. Head of an example from Helicops angulatus. 

 The right half is shown partly in optical section. 



C. G., cervical gland ; Cu., fold of cuticle ; L., lip ; R.M., retractor 

 muscles of head. 



2. Tanqua diadema, sp, n. 



The following is an account of the second form^ which, as 

 mentioned above, was discovered among the type-specimens 

 of Ascaris ohconica, Baird, from the intestii\es of the South- 

 American fresh-water snake Helicops angulatus. 



The male measures about 20 mm. in length and 0"G mm. 

 in thickness. The female is lari^er. 28-30 mm. \o\\'X and 



1 



