Types of Ascaris 
416 
In the female, the anus is almost terminal, and the tail is bluntly 
rounded. The vulva is situated at 15 mm. from the posterior end. 
The vagina runs at first in a forward direction from the vidva, and 
passes, without any definite demarcation, into the uterus. At a dis¬ 
tance of about 3 mm. in front of the vulva, the uterus bends back upon 
Fig. 3. Ascaris obconica: Ventral view (semi-diagrammatic) of the tip of the tail in the 
male: A., anus; 1-4, the four postanal papillae of the left side. 
itself, and at 2 mm. (in a straight line) from the bend it divides into 
two thin-walled branches, which are packed with eggs, and run down 
the body together to within 6 mm. from the posterior end. The uterus 
and its horns, from the bend anteriorly to nearly the posterior limit, 
are considerably convoluted. 
The eggs are spherical, and have a diameter of 100 p,. The shell is 
thick, and ornamented externally with somewhat coarse, rounded 
granulations. 
The accepted name of the host from which these specimens are 
recorded is now Helicops angulatus. 
Polydelphis boddaertii. 
Ascaris boddaertii Baird, 1860, p. 447. 
„ „ 1861, p. 229. 
„ Orley, 1882, p. 310. 
,, Stossich, 1896, p. 78. 
Baird’s description (1860) of this form is as follows: 
“ Head naked; valves of mouth distinct, large, somewhat triangular 
in shape. Body narrower at the anterior extremity, thicker towards 
the centre, and becoming narrower again at posterior extremity. Skin 
slightly striated; striae rather distant. Anus nearly terminal. Colour 
yellowish, or a deep straw-colour. 
