sonu; Parasitic Nematodes. 407 



From ilje presence of a vaji^inal outj^rowlli {'' coiiical ovi- 

 ])Ositor" of Sainbon) and of a long, spirally ornanientod tail 

 in (he female it seems safe to infer that all the three forms 

 iiere mentioned should be placed in the same ocnus; and, 

 since these features, taken together, are highly characteristic, 

 we may retain the generic name Wellcomi'a ^, IF. mitchelli, 

 Sambon, being the genotype. 



Unfortunately our knowledge of tlie m de is confined at 

 ])resent to IV. evoluta, as described by Hall (191G). In that 

 species there are in the male one pair of adanal and one pair 

 of jiostanal papilUe, a single, short, imperfectly chilinizeil 

 spicule, and a " tla.sk-sha[)ed " accessory piece. Slight alar 

 membranes extend between the adanal and |)Ostanal paj)illa! 

 of each side, and behind the postanal papillte the tail 

 diminishes in diameter to a slender Hlament. 



11. — A NEW Species of Ascasis from an Armadillo. 



Ascaris dasi/podi'na, sp. n. 



Host: Cabassous unicinctus [Dasr/pus gi/vmiirus^. 

 Position : small intestine. 



Locality : Paraguay. [The animal had been in captivity 

 in the Zoological Society's Gardens, London, for twenty-one 



For the material for this description the writer is again 

 indebted to the Director of the Wellcome Bureau and to 

 Dr. Sambon, by whom it was collected. 



The only species of "Ascaris^' recorded from Edentates 

 up to the present apjjear to be A. relusa, liud., 1819, 

 A. inanidis, Dies., 1851, and A. heriugii, v. Linst., lJ379. 

 .1. retusay which occurs in armadillos, is, according to 

 •Schneider, a lleterakis. A. manidis and ^1. heriyigii (the 

 former of which may not be an Ascarid at all) are compara- 

 tively small forms. The present material consists of a single 

 male and three females of a large stout species which appears 

 to be new. 



The male measures about 110 mm. in length and 2*2 mm. 

 in thickness ; the females 113-155 nun. and '2'6-2'lb mm. 

 respectively. The cuticular striations are coarse, about 

 0"02o mm. apart. The lips are large and fleshy, and simple 

 in shape. Tiiere are no interlabia. Well-marked marginal 

 dentigerous ridges are present on the lips ; they end in 



* The spelling' of this uaine has been altered by some authors to 

 It'elt'omeu or Welcoiniu. 



