63 
three short cupules each side, each bearing a complicated chitiuous 
sucker. All my observations were taken from the living worm, 
and I have not been able to enter into the minute points of the 
anatomy. The head end bears a circular anterior mouth with a 
short prepharynx and muscular pharynx. On each side of the 
pharynx is a small circular sucker. The pharynx leads to a very 
short oesophagus branching into two intestinal lobes, which are 
hardly visible owing to the great development of the vitellaria, 
which are greyish-brown and completely mask most of the 
intestine. The testes are a large group of round masses situated 
at the posterior half of the body; they begin about 0-60 mm. from 
the fan, and reach nearly to the middle of the body. From their 
anterior part a vas deferens runs up the centre of the body, and 
curving round ends in a chitinous penis, the male genital opening 
being just below the fork of the intestine. The penis is composed 
of five slender chitinous rods each side, the two central rods being 
much shorter than the others, and terminated by small knobs. 
This apparatus is very like Van Beneden's description of the same 
organ in PhyllocotyU gurnardi, but does not agree so well with his 
figures. Behind the penis is a bilobed organ, the function of 
which I could not determine. The ovary is a curved sausage- 
shaped mass in front of the testes; from it runs forward the 
oviduct, which receives the vitellarian duct, and then continues 
as the uterus, the anterior part of which is dilated with eggs in 
some specimens, in others, is quite narrow all the way along. 
The uterus opens by the side of the male opening on the left. 
The eggs are oval, pale yellow, and bear a filament at one pole 
only ; length of egg, 0-065 mm. without the filament. The vitel- 
laria arc well developed, and occupy the sides of the body for 
almost the whole length of the worm, even into the fan-like end 
portion. Transverse ducts join in a vitellarian receptacle about 
0 2 mm. in front of the ovary, and a single duct enters the oviduct. 
The armature of the posterior peduncle consists of six suckers 
arranged on the posterior half of the small disc borne on the end 
The outer pair are the largest, Y-shaped, the tail ending in a 
curved hook; the inner pair are similar but smaller, and in 
between the outer and the inner pairs are two very small hooks 
which seem to be anchor-shaped. 
With regard to preservation of this worm I find that when 
preserved in formalin (about 3 per cent.) the posterior end retains 
the extended form. 
