458 



Mr. H. A. Bay lis on new 



being quite rounded and the anus situated at only 0'23 mm. 

 from the extremity. Tiie thickness at tiie anus is 0'55 mm. 



The lips (fig. 1) are large and roughly hexagonal in 

 outline. Tiiere are three small interlabia (fig. 1, I.L.). As 

 seen from tlie front, each lip has two sharp projecting longi- 

 tudinal ridges internally, with an indentation between them. 

 Dentigerous ridges (fig. 1, D.R.) are well developed on the 

 inner surface of the lips. The "pulp" of each lip is pro- 

 duced anteriorly into two large rounded lobes. The ventro- 

 lateral lips have each a pair of very slightly raised papillae 

 (fig. 1, P.) ; the dorsal lip apparently has none. 



o o>Smm> 



Ascaris colura ; the bead, seen from the dorsal side. 



D.L., dorsal lip ; D.R., dentigerous ridges ; /.//., interlabium ; 

 P., papilla of ventio-kteral lip. 



The oesophagus is slender and of nearly uniform thickness 

 throughout. Its length is about 7 mm. From the point 

 where it enters the chyle-intestine a long intestinal diver- 

 ticulum runs forward to about 1*6 mm. from the anterior end. 

 There is apparently no oesophageal appendage. 



The vulva is situated at about 17 mm. from the anterior 

 end. The two uterine brajiches run backwards parallel to 

 each other. The coils of the ovaries extend back almost to 

 the posterior end of the body. The eggs are oval and have 



