414 
Tapes of Ascaris 
the body is marked in both sexes, but especially in the female, and is 
due to the fact that the genital organs are confined to this region of 
the body, neither the testis nor the ovaries and uterus extending beyond 
the posterior third. 
The largest specimen measures almost exactly 2 inches in length, 
as stated by Baird (52 mm. according to my measurement). This, how¬ 
ever, is the female specimen, the males being somewhat smaller. The 
maximum thickness (occurring at a point about 10 mm. from the 
posterior end) is 2 mm. 
The cuticle is thrown into marked transverse wrinkles at somewhat 
irregular intervals. There are also very fine and regular transverse 
striations, 4-2 p, apart. 
Fig. 1. Ascaris obconica: Nearly dorsal view of the head; D., dorsal lip; D.E.. dentigerous 
ridge; interlabium; P., papillae; V., ventro-lateral lips. 
The lips, as seen in a lateral view (Fig. 1), are almost square in 
shape, with a slight indentation in the middle of the anterior margin. 
The dorsal lip, which is slightly smaller than the ventro-lateral lips, 
measures 0-17 mm. in width, and about the same in depth. There is 
a single large papilla on the outer surface of each lip, rather far forward. 
These papillae are not very prominent. The inner surface of each lip 
is provided with a single dentigerous ridge, with exceedingly small 
teeth. There are three small conical interlabia. 
