17 
or less uniformly to within a short distance from the anus, when it 
gradually decreases in actual breadth, although it nmy increase in rela- 
tive breadth, owing to the decrease of the dorso-ventral diameter of the 
worm. The greatest breadth of the lateral band noticed in any speci- 
men was 96yu. In one specimen it measured 30.8 at the anal plane. 
INTERNAL STRUCTURE. 
Not an inconsiderable amount of the anatomy can be seen in speci- 
mens cleared in glycerine, but for an interpretation of some of the 
structures sections are necessary. 
Digestive system — The intestinal canal consists of three distinct 
portions: a long undivided esophagus; a long’ ch 3 de-intestine (midgut), 
and a distinct rectum. 
Eso 2 )liag\LS . — The esophagus (figs. 5, 10, 11, 15) is 2.5 to 2.9 mm. 
long; anteriorl}" it is 88 to lllyu in diameter; caudad it increases in 
diameter, at first slowh% then more rapidl}^, attaining its maximum 
22815 — No. 34—07 2 
