SEA-FISHERIES LABORATORY. 189 
INTERNAL PARASITES AND DISEASED 
CONDITIONS OF FISHES. 
By Jas. JOHNSTONE. 
Dibothrium crassiceps, Rudolphi. 
When trawling to the South-west of the Calf of Man 
in June, 1908, a small hake was caught which contained, 
in its intestine, about a dozen Cestodes, which I refer to 
the above species. The measurements of this worm are: 
Total length of the strobilae: 50 to 60 mm. 
Greatest breadth of the proglottides: 3 mm. 
Greatest length of posterior proglottides: 1mm. 
Diameters of the scolex: 1°77 x I'7 mm. 
The anterior part of one of these worms is represented 
in fig. 14, and it will be seen that the scolex is spherical. 
Fic. 14. Dibothriwm 
crassiceps, Rudolphi. 
Mag. 11 dias. 
A prominent groove divides it longitudinally into two 
sectional lobes, and in each lobe there is a bothrium. The 
latter presents itself externally as a longitudinal slit, 
widest at the middle, and drminishing to a mere chink 
at its anterior and posterior extremities. It is situated 
rather nearer to the anterior end of the scolex. 
