478 WILLIAM NICOLL. 
Laurer’s canal. No receptaculum seminis could be made out 
with certainty. 
The yolk-glands are almost entirely confined to the sides 
of the body and extend from the pharynx to the posterior 
end. They do not unite in the middle line posteriorly, but a 
few follicles stretch across the body just behind the pharynx. 
The intestinal diverticula are overlapped to a slight extent, 
especially posteriorly. The transverse yolk-ducts pass a 
little in front of the anterior testes to unite in a small 
reservoir. 
The uterus is confined to the posterior half of the body 
and does not overlap the intestinal diverticula. Its course is 
typical of the genus, but it differs in being more voluminous 
in front of the posterior testis than behind it. It does not 
overlap the testes. The ova are not very numerous; they 
measure ‘031 by ‘019 mm. and have a bright yellow shell. 
The chief diagnostic features of this species are therefore 
the short cirrus-pouch and the forward position of the 
ovary. 
The specimen from Motacilla flava was smaller and 
shehtly narrower; length 1:4 mm. Oral sucker +17 by 
‘16 mm.; aperture ‘09 by *03 mm.; thickness of wall *03 
mm. Ventral sucker two fifths of the body length from 
the anterior end, size ‘14 by ‘15 mm.; aperture circular. 
Pharynx *054 by ‘069 mm. Spines ‘0096 mm. long. 
Cirrus not completely exserted. Vesicula seminalis dis- 
tinctly bipartite, with a small anterior and a larger posterior 
part; combined length of the two parts ‘066 mm. ‘The 
distinct bipartite condition of the vesicula in this specimen 
is one reason for doubting if it is really identical with the 
specimen from Anthus obscurus. Possibly the difference 
in the state of exsertion of the cirrus may account for the 
variation in the vesicula. 
The genital glands have much the same situation as before, 
but the posterior testis is only *12 mm. from the end of the 
body and the anterior testis ‘13 mm. behind the ventral 
sucker. They are smaller and not so elongated, -17 by 
