W. Nicoll 
189 
considerably less. Every species of fish except Zeugopterus punctatus 
(a single specimen) yielded one or more species of parasite. The most 
varied fauna was found in the witch, Pleuronectes cynoglossus (nine 
species), the horse-mackerel, Trachurus trachurus (eight), the halibut, 
Hippoglossus vulgaris (eight), and the long rough dab, Drepanopsetta 
platessoides (seven). 
In addition to the fish dealt with while in Aberdeen, I have since had 
the opportunity of examining 28 specimens of Trachurus trachurus 
which were kindly sent to me by Dr H. Chas. Williamson, who also 
sent me specimens of parasites from Anarrhichas latifrons, Raja 
macrorhyncha and Laeviargus rnicrocephalus. The horse-mackerel 
were examined chiefly for the purpose of obtaining further specimens 
of Ancylocoelium typicum but without success. 
The following is a list of the fish examined and the parasites obtained 
from each. The figures in brackets refer to the number of specimens 
of each species of fish and the number of times each particular parasite 
occurred: 
1 . 
Sparus centrodontus. Sea-bream (11) 
Zoonogenus vividus Nicoll 
Rectum (2) 
Hemiurus communis Odhn. 
Stomach (3) 
2. 
Trachurus trachurus. Horse-mackerel (2) 
Ancylocoelium typicum Nicoll 
Intestine (1) 
Tergestia laticollis (Uud.) 
(b 
Lecitliaster gibbosus (Rud.) 
Stomach (2) 
Ectenurus lepidus Looss 
» (2) 
3. 
Scomber scombrus. Mackerel (6) 
Pharyngora bacillaris (Molin) 
Intestine (2) 
Lecithocladium excisum (Rud.) 
Stomach (1) 
4. 
Zeus faber. John Dory (1) 
Lecithaster gibbosus (Rud.) 
Intestine (1) 
5. 
Trachinus draco. Greater Weever (1) 
Hemiurus communis Odhn. 
Stomach (1) 
6. 
Lophius piscatorius. Angler (2) 
Derogenes various (Mull.) 
„ (1) 
Hemiurus communis Odhn. 
. (1) 
Bucephalus gracilescens (Rud.) 
Intestine (1) 
7. 
Gadus pollachius. Pollack (1) 
Hemiurus communis Odhn. 
Stomach (1) 
Bucephalus gracilescens (Rud.) immature 
Stomach (1) 
8. 
Merluccius merluccius. Hake (3) 
Derogenes various (Miill.) 
I 2 ) 
Hemiurus ocreatus (Rud.) 
(2) 
