SO 
The worm was found attached by its large ventral sucker to 
the inside wall of the stomach of the Starry Bay. It is large and 
conspicuous, measuring 32 mm. in length, with a thick cylindrical 
body, somewhat flattened dorso-ventrally. The suckers are both 
globular, very muscular, with circular apertures, and capable of 
being protruded far. The ventral sucker shows dorsally as a 
circular indentation. The cuticle is unarmed, but thick and 
wrinkled. The breadth of body is about 2-6 mm., rounded off at 
each end. It is opaque white, except the eggs and intestine, the 
latter being pale yellowish-brown, and the former, from the colour- 
less young ones, through pale yellow, deep yellow and brown, to 
deep purplish-brown according to age. The oral sucker measures 
1*2 across, and is not quite at the anterior end but slightly 
ventral. The ventral sucker measures 2-4 mm. across, just twice 
the diameter of the oral sucker, and is placed far forward. There 
is no prepharynx. The pharynx measures 0*40 mm. long, and 
0-35 mm. broad. There is a very short oesophagus branching into 
two long and broad lobes reaching to the posterior end of the body. 
These come forward anteriorly slightly before running downwards, 
and for the whole of their length have sinuous and irregular walls. 
The intestine contains a yellowish-brown fluid. The excretory 
bladder is Y-shaped, forking by the hind testis, the lobes reaching 
anteriorly to the level of the pharynx. The testes are placed one 
behind the other, and touching each other. They are roundish 
masses, the hind testis (1-50 mm. across) larger than its fellow 
(1-30 mm. across), and placed near the middle of the body, the 
front testis being at about the centre. From each is given off a 
vas deferens which runs up to join the vesicula seminalis without 
uniting with its fellow. The vesicula seminalis is small, somewhat 
club-shaped, and contained in an inflated cirrus sac in front of 
the ventral sucker and to the left side. The remainder of the male 
duct was not exactly seen, but the cirrus sac apparently narrows 
very considerably and finally opens into a roomy genital sinus on 
the right side, which opens in a central genital pore just by the 
pharynx. The ovary is in front of the foremost testis, to the right, 
and touches it. It measures 1-2 mm. across, and is globular, 
narrowing slightly anteriorly. Across it ventrally stretch the trans- 
verse vitellarian ducts, which unite in a receptacle from which a 
duct opens into the oviduct. The receptaculum seminis is absent, 
bat there seems to be a Laurer's canal which I could not make out 
very clearly. The oviduct passes into a much winding uterus full 
