190 
Trematodes of Fish 
9. Brosmius brosme. Tusk (4) 
Derogenes various (Mull.) 
Hemiurus communis Odhn. 
10. Pleuronectes cynoglossus. Witch (7) 
Steringophorus fureiger Olss. 
Zoogonoides viviparus (Olss.) 
Cercaria cestoides nov. 
Stomach (2) 
„ ( 1 ) 
Intestine (2) 
Eectum (2) 
Stomach wall in cyst (1) 
11. Pleuronectes limanda. Common Dab (5) 
Hemiurus communis Odhn. Stomach (1) 
12. Pleuronectes mierocephalus. Lemon Dab (1) 
Derogenes various (Mull.) Stomach (1) 
13. 
Drepanopsetta platessoides. Long rough Dab (7) 
Steringophorus fureiger (Olss.) 
Rliodotrema ovacutum (Lebour) 
Zoogonoides viviparus (Olss.) 
Intestine 
Rectum 
( 1 ) 
(3) 
(3) 
14. Conger conger. Conger eel (1) 
Lecithochirium rufoviride (Rud.) Stomach (1) 
15. Anarrhichas latifrons. Spotted Cat Fish (1) 
Lebouria idonea Nicoll Intestine (1) 
16. Raja macrorhyncha (1) 
Otodistomum cestoides (van Ben.) Stomach (1) 
Most of the parasites collected are common and well-known forms 
and only in a few cases are brief notes necessary. 
Stephanochasmus baccatus Nicoll. 
(PI. XIII, fig. 1.) 
Five specimens of this species were obtained from the rectum of 
a halibut (Hipjwglossus vulgaris). They were somewhat smaller than 
the specimen from which the original description (Nicoll, 1907, p. 80, 
PI. 11) was made. The smallest individual measures 2 mm. in length 
and contained only one ovum, so that it may be assumed that the species 
does not begin to produce ova till it reaches this size. The length of 
the mature specimens is 2-3'3 mm. and the average 2'6 mm. In a 
specimen of this length the maximum breadth is '56 mm. and is usually 
to be found in the testicular region, although sometimes it is across the 
ventral sucker. As a rule the neck is somewhat more slender than is 
shown in the original figure. It widens gradually till the ventral sucker 
is reached, beyond which the body becomes narrow but broadens 
out again towards the posterior end. The latter is rounded but 
