of the Fishery Board for Scotland. . 85 
reveals certain interesting differences, which are fully described by 
Professor van Beneden in the paper referred to, published in the Bulletin 
of the Royal Academy of Belgium for 1889. 
In this paper he remarks that at first sight it suggested to him a 
likeness to Z'etrabothrium maculatum, Olsson, a form previously recorded 
from the same kind of fish, and therefore he gave the species the name of 
Diuplobothrium simtle—the generic uame Diplobothrium referring to the 
peculiar arrangement of the bothria, He states further that ‘“‘ce qui 
caractérise surtout ce genre, cest qu'il a, comme le précédent, une 
cloison compléte entire les deux couples of bothridies ; cette cloison 
présente &2 son sommet quatre piéces qui semblent fournir des points 
d’appui a la couche musculaire ; sous certains aspects, ce Cestode resemble 
beaucoup au Cestode, dont nous venons de parler, et qui a été décrit par 
Olsson ; mais les organes qui lui ont fait donner le nom de Tetrabothrium 
sont complétement isolés, tandis que dans le Diplobothrium ils sont 
réunis deux par deux ; a l’extérieur on croirait voir par moments quatre 
orifices parfaitement séparés, tandis qu’en réalité il y’a, de chaque coté, 
une séparation qui ne s’étend pas jusqu'au bord des orifices.” 
Genus Abothrium, P. J. van Beneden (1870). 
Abothrium rugosum (Goeze). 
1782. Taenia rugosa, T. A. S. Goeze, Versuch siner Naturg. der 
EKingeweiderviirmer thierscher Korper, p. 41]. Tab. xxxiil., 
figs. 1-5. 
1808, Bothriocephalus rugosus, Rudolphi, Entoz. Hist. Nat., 
Vol. III., p. 42. 
1850. Dibothrium rugosum, Diesing, Syst. Helminth, Vol. L., 
p. 591. 
1870. <Abothrium gadi, van Beneden, Poissons des cotes de 
Belgique p. 56, Pl. V., fig. 14. 
This Cestode appears to be common in the sexually-mature stage in the 
larger gadoids. Its head is invariably inserted in one of the cecal tubes 
and so intimately incorporated with its tissues as to have the appearance 
of forming an integral part of the tube. For this reason, the attempts 
made to remove the head of the worm from the tissues of the pyloric 
czeca have usually ended in failure, and no satisfactory description of this 
part of the worm has yet been published. 
The piercing of the wall of the pyloric ceca by the head of the Cestode 
produces certain curious results ; the cecal tube becomes distorted some- 
times to a considerable extent, nodular processes are formed, and 
frequently, as remarked by Linton, a yellowish waxy deposit is formed 
consisting of the degenerated tissue of the ceca. The worm, which 
extends from the cecal tube to the intestine, is often in the larger fishes 
of considerable length ; specimens from such fishes sometimes reach to 
twenty-five and thirty inches, but as, like most other Cestodes, they are 
very contractile, the specimen that may, while living, stretch to thirty 
inches will be found to be little more than half that length when 
preserved, especially if the preservative be alcohol. Linton records a 
specimen 65°5 millimeters in length, while Johnston obtained one that 
measured 85 centimeters,* equal to about 34 inches. 
* Report for 1906 on the Lancashire Sea Fisheries Laboratory, p. 171. 
