H. A. Baylis 
413 
Ascaris bifaria. 
Ascaris bifaria Baird, 1853 a, p. 26; PI. I, Figs. 2, 2 a. 1853 6, p. 19 1 . 
,, Diesing, 1861, p. 661. 
„ Orley, 1882, p. 310. 
Of this form, as in the preceding case, there is a single specimen, 
which is a female, and in somewhat poor condition. It has not been 
possible, therefore, to do more than examine its external features. 
This examination, and a comparison with specimens in a better state 
of preservation, leads me to the conclusion that it is referable to the 
common Ascaris lumbricoides of man 2 . This is especially borne out by 
the shape and size of the lips, and by the fine striations of the cuticle. 
The transverse measurement of the dorsal lip (about 0-6 mm.) 
agrees well with that found in the female specimens of A. lumbricoides 
used for comparison. 
Ascaris obconica. 
Ascaris obconica Baird, 1860, p. 447. 
„ „ 1861, p. 229. 
„ Orley, 1882, p. 310. 
,, Stossich, 1896, p. 80. 
The material is contained in a bottle 3 bearing the label “ Ascaris 
obconica Baird. From the intestines of the Uranops angulatus, a fresh 
water snake (Brazil).” There are two male examples, and one female, 
in a tolerably good state of preservation. Baird’s original diagnosis is 
very brief, and reads as follows: 
“Ascaris obconica. 
“Head naked; valves of the mouth small but projecting. Body of 
male slender for three-fourths of its length, then rapidly becoming 
thicker till within a line or two of the extremity, which is blunt, straight, 
or only slightly indexed, and terminating in a little papilla. The skin 
is strongly striated. Male spicula within half a line of posterior 
extremity. Colour of body slightly yellow, or light straw. 
“ Length (male, largest specimen) 2 inches.” 
A re-examination of the material permits of a somewhat fuller 
description. The spindle-shaped thickening near the posterior end of 
1 As in the ease of “A. laevissima," Baird’s second description is a repetition of his 
original diagnosis, with slight changes in order and wording. Orley includes the name 
in his list of species, without description or comment. 
2 See footnote to preceding form. 
3 Some smaller specimens in the same bottle prove to belong to a species of Tanqua. 
27—2 
