53 
I have not given this worm any name, as I hope to be able to 
investigate it more thoroughly first. 
Genus — Zoogonoides (Odlmer). 
Zoogonoides vinparus (Olsson). (Plate IV., fig. 1.) Odlmer, T., 
" Mittheilungen zur Kenntnis der Distomen I.," Centralbl. f. Bakt., 
etc., XXXI., 1902, page 53. 
This Trematode occurs frequently on this coast in the end part 
of the intestine of the Dab, Long Rough Dab, and Plaice. The Long 
Rough Dab appears to be a new host. It is recorded from the Dab, 
Plaice, and Turbot by Nicoll from St. Andrews. Like him I have 
often found it in the Dab with Steringopherous furciger* It is very 
small, my specimens measuring 1-1 mm. long, and are bright red 
when alive ; the colour, however, soon fades. The ventral sucker 
is twice the size of the oral; oral sucker 0-12 mm. across, ventral 
sucker 0-24 mm. across, both circular, the ventral sucker being 
' almost exactly at the centre of the body. The body is oval, some- 
what pointed at botli ends, and covered with small spines. Greatest 
breadth at the ventral sucker 0-40 mm. The mouth leads to a 
very short prcpharynx, the pharynx measures 0-05 mm. long, and 
the oesophagus is about twice the length of the pharynx. The 
intestinal lobes reach to about the centre of the ventral sucker. 
The excretory vesicle is small and oval. The testes measure 0-01 
mm. across; they are oval bodies placed one each side of the 
ventral sucker, sometimes extending behind it, sometimes almost 
on a level with the centre. A thin vas deferens runs from each 
to the two-lobed vesicula seminalis, which is entirely enclosed in 
the cirrus sac. The latter is sickle-shaped, and occurs just in front 
of the ventral suckers, and encloses in front of the vesicula seminalis 
a well-developed pars prostatica and a cirrus armed with spines. 
The duct opens into a very small genital sinus, from which the 
sums is often seen projecting. The ovary is almost spherical, 
about 0-01 mm. across, and placed behind the ventral sucker on 
the right ; from its posterior end runs the oviduct, giving off a 
reccptaculum seminis and Laurer's canal, then turning and receiv- 
ing the vitellanan duct. The uterus is long and winding, and 
contains no eggs with shells, but thin-walled capsules containing 
miracidium larva?. The loops take up most of the posterior part 
of the body, and the uterus then runs forward and opens as a thin- 
walled vagina into the genital sinus. The miracidium is curled up 
* Xicoll, op. cit., page 83. 
