44 BilharziasU 
sucker, and ultimately gives rise to the intestinal caeca. These caeca pass back 
laterally when they fuse to form a single tube which terminates posteriorly 
in a blind end. 
The intestinal caeca are dark in colour owing to digested blood. The 
reproductive organs consist of irregularly rounded testes lying dorsal to 
Text-fig. 1. Scliistosomum haematobium. Adult $ and $ x 30. 
From drawings made to scale by Dr J. K. Lund. 
LETTERING TO TEXT-FIGURES 1 AND 2. 
A.S. anterior sucker; A.C. ventral sucker; AL. bifurcation of alimentary canal; OES. oesophagus; 
N. C. nerve chord; G 0. genital opening; F.£. vesicula seminalis; T. testes; /.intestine; /.(/.union 
of intestinal caeca; G.C. gynaecophoric canal; T.B. tuberculations; VA. vagina; TJT. uterus; 
O' lateral spined ovum; 0" terminal spined ovum; 00. ootype; S.G. shell gland; OV. ovary; 
OVD. oviduct; V.G. vitelline glands. 
