544 A DESCRIPTION OF THE ENTOZOA COLLECTED BY DR WILLEY 



Galliohothrinm and describes the three species C. verticUlatum Rud. from Mustelus 

 vulgaris and also from Galeus canis and Squatina angelus. C. leuckartii from Mustelus 

 vulgaris and G. eschrichtii from the same host. Zschokke in his Monograph '"' Recherches 

 sur la Structure Anatomique et Histologique des Cestodes,"' describes C. filicolle from 

 the spiral valve of a Torpedo marmorata, G. crassicole from the same organ in a 

 Trygon pastinaca, and G. uncinatum found in the intestine of Raja batis and Haja 

 clavata and Trygon pastinaca. A seventh species G. coronatum is described in P. -J. 

 van Beneden's " Les Poissons des Cotes de Belgique "' and by Olsson in his " Entozoa, 

 iakttagna hos Skandinaviska hafsfiskar"^ from Eajn batis and Raja clavata, ScyUium 

 catulus and ScyUium stellare. 



In an Aetiobatis narina?-i Euphras. taken at Lifii, Dr Willey found two species 

 of Cestoda, both living in the middle region of the intestine where the spiral valve 

 lies. The extreme upper end of the intestine was free from parasites, the lower end 

 contained no Cestodes but some Nematodes. The species which I have described below 

 as Adelobothriuin was much more plentiful than the other which proved to be a new 

 species of Galliobothrimn. The latter svas easily removed but the former was firmly 

 attached to the walls of the intestine and was i-emoved with difficulty. No hooks 

 could be discovered on this species and suckers could not be detected. 



There can be no doubt that the less numerous Tape-worm found in the Aetio- 

 batis narinari belongs to the genus Galliobothrium. Zschokke* points out that " Le 

 genre Galliobothrium serait caracterise sufiisamment par le seolex portant quatre both- 

 ridies divises invariablement en trois compartiments superposes par deux hourrelets 

 transversaux. Le sommet du seolex porte quatre ventouses auxiliaires plus ou moins 

 developees. Au bord superieur de chaque bothridium on trouve : ou bieu quatre 

 crochets simples (C. Leuckartii et 0.^ verticillatum) ou deux crochets bifurques, (C. 

 coronatum, crassicolle, uncinatum, Jillicolle). En tout cas le seolex est armd de seize 

 pointes." 



My species has the hooks bifurcated and therefore is more nearly allied, as 

 to this point, with Zschokke's second group. In sections it becomes apparent that 

 the hooks are hollow at their base like the horn of a hollow horned ruminant. I have 

 carefully compared the animal with figures of the above-mentioned species and find 

 that it differs from them in certain points which I think are of specific import- 

 ance. 



In all the figui'es and descriptions of species of Galliobothrium that I have seen 

 the greatest diameter of the head is either about half-way between its anterior and 

 posterior faces or at its posterior end. In the former case the head is barrel-shaped, 

 in the latter it resembles a pear. In the species in question, however, the head is 

 very definitely broader at its anterior surface ; it narrows in the centre and expands 

 again posteriorly though not to quite the same extent as in front (Fig. 12, Plate LV.). 



' Mem. Iivit. Geiiev. xvii. 1889. 



- Mem. Ac. Belriique, xxxviii. 1871. 



» Acta Unic. Lund. m. 1866—7. 



■• Mem. Inst. Genev. xvii. 1886— 188il. 



" Zschokke unites the genus Onchobothrium with Culliobntltrium. 



