some Parasitic Nematodes. — 497 
From the presence of a vaginal outgrowth (“ conical ovi- 
positor ” of Sambon) and of a long, spirally ornamented tail 
in the female it seems safe to infer ahaa all the three forms 
here mentioned should be placed in the same genus; and, 
since these features, taken together, are highly characteristic, 
we may retain ane generic name Wellcomia *, W. mitchelli, 
Sambon, being the genotype. 
Unfortunately our knowledge of the male is confined at 
present to W. evoluta, as deseribed by Hall (1916).% In that 
species there are in the male one pair of adanal and one pair 
of postanal papille, a single, short, imperfectly chitinized 
spicule, anda “ flask-shaped ” accessory piece. Slight alar 
membranes extend between the adanal and postanal “papillae 
of each side, and behind the postanal papille the tail 
diminishes in diameter to a slender filament. 
II.—A New SPECIES OF Ascaris FROM AN ARMADILLO. 
Ascaris dasypodina, sp. n. 
Host: Cabassous unicinctus [Dasypus gymnurus |. 
Position : small intestine. 
Locality: Paraguay. [The animal had been in captivity 
in the Zoological Society’s Gardens, London, for twenty-one 
days 
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 ‘f Ascaris”’ recorded from Edentates 
up to the present appear to be A. retusa, Rud., 1819, 
A. manidis, Dies., 1851, and A. heringii, v. Linst., 1579. 
A. retusa, which occurs in armadillos, is, according to 
Schneider, a Heterakis. A. manidis and A. heringit (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 mm. and 2°5-2°75 mm. 
respectively. The cuticular striations are coarse, about 
0°025 mm. apart. The lips are large and fleshy, and simple 
in shape. ‘There are no interlabia. Well-marked marginal 
dentigerous ridges are present on the lips; they end in 
* The spelling of this name has been altered by some authors to 
Welcomea or Welcomia. 
