H. A. Baylis 415 
six preanal papillae on either side, passing anteriorly into a double row, 
“probably again becoming single/’ 
Host: Bitis gdbonica. 
Distribution: Africa. 
3. Ophidascaris obconica (Baird, 1860). 
Ascaris obconica Baird (1860), p. 447. 
,, ,, Baird (1861), p. 229. 
„ „ Orley (1882), p. 310. 
„ „ Stossich (1896), p. 80. 
„ „ Baylis (1916), p. 413; Text-figs. 1-3. 
This species has already been fairly fully re-described by the writer (1916). 
The following is a short summary of its chief characters. 
Length up to 52 mm. (female); males slightly smaller. Maximum thickness 
2 mm. A fusiform thickening of the posterior region of the body. Cuticular 
striations 4-2 gu apart. Lips almost square, with an indentation in the anterior 
margin, and with the free angles rounded. Dentigerous ridges marginal. 
Interlabia small, conical. Well-marked grooves at bases of lips, almost 
meeting in middle line of lip. Oesophagus 2-3 mm. long. Tail in both sexes 
very blunt, without terminal spike. Spicules of male 2-48 mm. long and 0*08 
mm. wide. Four pairs of postanal papillae, near tip of tail, and about 40 pairs 
of preanal papillae. Vulva in posterior third of body, dividing the total length 
in about the proportion of 12 : 5. Vagina runs forward, passing into the 
uterus a little in front of the vulva; uterus then bends back and gives off two 
branches which run, with many convolutions, parallel to each other towards 
the posterior end. Ova spherical, 0-1 mm. in diameter, with coarsely granulated 
shell. 
Host: Ilelicops angulatus. 
Locality: Brazil. 
