92 Mr. W. Nicoll on (he 



accompanied by cysts contaiuing Treraatode cercariie. The 

 only purts not alTcctcd were the brain and the abdominal 

 or«jans. The pigment-spots appeared to follow the course o£ 

 tlie blood-vessels, as is evident from fig. 13, and they are 

 probably spread throughout the body by means of the blood. 

 The nature of the pifjmcnt T did not ascertain. The Trema- 

 tode is a small tailless larva, havinji^ the body entirely 

 covered with minute spines, two small suckers, and with 

 intestinal diverticula extending to the tip of the tail. I am 

 at present unable to assign it to any known species. 



This occurrence may admit of explanation in the same 

 ■way as Johnstone * accounts for a similar infection of 

 Pleuronectes iunanda, although the parasites in the two cases 

 are not identical. 



Distomum sp. 



From gills of Cot t us scorpius and Gobius Ruthensparri in 

 capsules. 



This occurred rarely, but in infected specimens the 

 numbers were large. The wall of the cyst was thin, so that 

 the enclosed larva coidd be easilv seen. It possessed few 

 distinctive features, so that identification was, for the time 

 being, impossible. 



N E M A T O D A. 



Ascaropsis morrhua, van Beneden. (PI. IV. figs. 14—16.) 



Ascaropsis morrhucB, van Beneden, M^iu. Acad. Belg. 1871, xxxviii. 

 p. .56, pi. iii. fig. 11. 



Van Beneden appears to have instituted this genus and 

 species at one and the same time, but he gives no definition 

 of the genus or description of the species except a few words 

 in a footnote and drawings of the bead, tail, and ovum. 

 From these, however, I am able to establish the identity of 

 the specimens which I as=sign to this species. 



Van Beneden found it in the intestine and pyloric cseca of 

 tlie cod [Gadus inorrJuia). 1 have to record it from Gudus 

 cefjlefmus, Hippoylossus vulfjaris, and Coitus bubalis. In each 

 of the two latter only one specimen occurred, but in the 

 haddock it was extremely numerous and was met with 

 throughout the whole anterior part of the alimentary canal. 



The body is elongated, narrow, and cylindrical, of almost 

 uniform girth ; attenuated anteriorly and posteriorly, with a 



* Report Lancashire Sea-Fisheries Laboratory for 1S04, p. ]01. 



