78 .Mr. \\ . .\icoil on the 



The anterior rcjjiou is correct except that the genital aper- 

 ture is rather far forward and the cnticuhvr spines have 

 assumed enormous proportions. The ventral sucker has a 

 somewhat powerful appearance, and the vesieula seminahs 

 extends as far back as the anterior testis. The testes are 

 correctly enough placed, but the ovary is posterior to them 

 instead of in tront. The uterus displays the greatest 

 divergence; it is represented as two tubes, wiuding down, 

 one on each side of the body, to the extreme posterior end. 

 It is to be presumed that Cobbold here contused the uterus 

 with the vitelline glands, the rounded follicles of which 

 might be mistaken fur ova. The uterine walls must have 

 been sujjplied from imagination. 



Cobbold fancies a resemblance between this species and 

 Diatomuin scabrum, Zed., and D. appendicalatam; Rud. 

 \V herein this lies I fail to perceive, even in Cobbold's figure, 

 for the organization of the alimentary system with its long 

 pre-pharynx, the presence of the large spines, and the dispo- 

 sition of the entire genital system are widely ditfercnt from 

 the corresponding structures in the above-mentioned species. 



Stossieh's description of this form is merely a brief trans- 

 lation of Cobbold's. Along with von Linstow* he falls 

 into the error of attributing it to the cod [Gadus morrhua) 

 instead of Gadus acjlejiuus, although Cobbold is perfectly 

 clear on this point. 



A not uncommon parasite of the haddock, it occurred in 

 rather more than 50 per cent, of individuals examined, 

 always in the intestine and never in large numbers. It is 

 of moderate size: length r88— t-fZ mm., maximum breadth 

 •6l-'90 miu. ; average size 265 x (39 mm. ; body of elon- 

 •j-ated oval outline, rounded at both ends, somewhat attenuate 

 anteriorly. It is of compact build, sluggish in movement, 

 and does not long survive removal from its host. The 

 cuticle is beset with stout regularly arranged spines cover- 

 ing the whole of theant-aectabular region and gradually 

 disappearing behind the ventral sucker. A few spines are 

 to be found laterally within a short distance of ttie tip of 

 the tail. The length of the spines is about '012 mm., but 

 they are shorter in front and longer posteriorly. They have 

 comparatively broad bases and are arranged so that the 

 spines of each row alternate with those of adjacent rows. 



The oral sucker is almost terminal, of fair size (diameter 

 •2-lr-"38 mm.), but not very muscular. The ventral sucker is 

 remarkably small and feeble ; it is situated almost centrally 



♦ Compend. d. Ilclminthol. 1878, p. 2.38. 



