of the Fishery Board for Scotland. 299 



millimetres in length had a Hcemohaphes on each side, but no Chondra- 

 canthus. The total number of parasites observed on this sample of fifty- 

 five Spotted Dragonets was twenty three, and they comprised fifteen 

 Ila-mohaphes amhiguus and eight ChondracaidJuts ornatus. It was also 

 observed that when only one parasite occurred it was frequently on the 

 right side — the fish resting on its ventral surface and with its head 

 toward the observer. 



It may be further noted that seventeen specimens of the Common 

 Dragonet, Gallionymus hjra, captured at the same time and place, were 

 also examined, but no parasites were observed on them. 



Fam. LERNJiOPODiD^. 



Genus Thysanote, Kroyer (1863). 



Thysanote impudica (Nordmann). 



This species was recorded in Part III of the Eighteenth Annual 

 Eeport (p. 169), but there was some douht as to the exact locality where 

 the fish on which it was obtained came from, but I am able to record the 

 occurrence of another specimen which was obtained on the gills of a 

 Trigla hirundo captured in Burghead Bay, Moray Firth,on July 1st, 1901. 



II. 



TEEMATODA. 



In the present paper I am able to record only two Trematodes in 

 addition to those described in my paper on Fish Parasites published in 

 Part III. of the Nineteenth Annual Keport, but they both appear to be 

 of special interest. They are each provided with a single large 

 posterior sucker which is discoidal and sessile or nearly so, and would 

 thus appear to belong to the Tristomatidse, but they differ in several 

 important i)oints not only from each other, but also from the Tristomes 

 described in my previous paper. 



Fam. TRISTOMATIDiE.* 



Genus Callicotyle, Diesing (1850). 



C(dlicotyle Krijyeri, Diesing. PI. XIIL, fig. 30. 



1850. Calicotyle Kr'dyeri, Diesing, Syst. helminth., vol. i., p. 434. 

 1856. Calicotyle Krdyeri, Hok, Ofvers of K. Vet. Akad. 



Fbrhandl Stokholm, September 20th (1856). 

 1858. Calicotyle KrUyeri, Diesing, Denkschrift. d. K. Akad. d. 



Wissensch, vol. xiv., p. 70. k., i, figs. 16-20. 

 1863. Callicotyle Kroyeri, P.- J. van Beneden and Hesse, Rech. 

 sur les Trematodes, p. 79 

 The Trematode which I ascribe to this species was obtained in the 

 cloaca of specimens of Raia radiata, Don., captured about 60 miles south- 

 east of the Shetland Islands on May 22ud, 1901. Specimens of the 

 same Trematode wore subsequently observed on liaia radiata ca[)tured 

 off Aberdeen ; as well as on a small Raia clavata captured in the Clyde 



* In the Cambridge Natural History, vol. ii., p. 73, Van Beneden's division of the 

 Trematodes into Monogonea and Digonea is adopted, and Callicolifte is, along with other 

 two genera, placed in the sub-family Monocotylimc Tschbg— one of the three sub-families 

 into which the Tristomatida; are divided. 



