W. Nicoll 
355 
CESTOP A. 
As already remarked, Cestode parasites were rather uncommon, the 
only fish to harbour adult tapeworms being Cottus scorpius and Gadus 
pollachius. In 40 °/o of the former Bothriocephalus bipunctatus Zeder 
was found, and in 55 °/ 0 of the latter Abothrium rugosum (Goeze) 
occurred. Both of these parasites are common and well-known forms 
and require no additional description. B. bipunctatus is an exceptionally 
frequent parasite of the turbot ( Bothus maximus ) and Abothrium rugosum 
is a typical Gadoid parasite. 
Bothriocephalus scolices were found in the intestine of Gobius 
ruthensparri and Labrus berggylta but in very scanty numbers. 
Scolex poly morphus Ruck, which, in one or other of its various forms, 
is probably the commonest parasite of marine Teleostean fishes, was 
found in the alimentary canal of ten different fishes. It occurred most 
frequently in Drepanopsetta platessoicles, Conger conger and Labrus 
berggylta, being present in at least 50 °/ 0 of these fishes. Of the total 
number of fish examined at Millport 16 % were infected by this parasite. 
This figure is exceeded only by Podocotyle atomon (22°/ 0 ). 
This peculiar scolex is a composite form and includes the larvae of 
several species of Calliobothrium which become adult in the intestine 
o‘f Elasmobranch fishes. A full description of it will be found in Zschokke 
(1889, pp. 251—259, PI. VI, figs. 103—4). 
A LIST OF THE FISHES EXAMINED, 
WITH THEIR PARASITES. 
ACANTHOPTEBYGII. 
Scomber scombrus. 
Pharyngora bacillaris (Molin). 
Intestine. 
Lecithocladium excisum (Rud.). 
Stomach. 
Scolex polymorphus Rud. 
Intestine. 
Cottus scorpius. 
Podocotyle atomon (Rud.). 
Intestine. 
Stephanoehasmus baccatus Nieoll. 
Rectum. 
Derogenes various (Muller). 
Stomach. 
Bothriocephalus bipunctatus Zeder. 
Intestine. 
Scolex polymorphus Rud. 
Intestine. 
Cottus bubalis. 
Podocotyle atomon (Rud.) 
Intestine. 
