115 Part III. — Twenty -third Annual Report 



in outline. Only one or two specimens of this form have yet been 

 observed, and as it resembles Chondracanthus depressus in some respects 

 I record it for the present as variety oblongus of that species (see figs. 

 14-17, pi. vi.). 



Fam. Lern^eopodid^e. 



Genus B?'achiella, Cuvier (1817). 



Brachiella triglce, Claus 



1901. Brachiella triglce, T. Scott, 19th F.B. Kept., Pt. III., 

 p. 133, pi. vii., figs. 24-29. 



Habitat. — Obtained on the gills of a Streaked Gurnard, Trigla lineata, 

 captured at Station VIII., Firth of Forth, in September, 1897, but only 

 now recorded. The Forth is a new station for this species. 



PART II. 



On some Species of Trematoda not previously recorded. 



The ecto- parasitic vermes of fishes are not uncommon, but as many of 

 them, and especially of the Trematoda, are of small size and more or less 

 flattened, and as their colour approximates closely to that of the fishes on 

 which they live, they are readily missed when the fishes are being 

 examined. 



There is evidently a considerable variety of forms among these Tre- 

 matodes. That some of them are elegant in outline as well as in structure 

 is shown by the beautiful drawings in MM. van Beneden and Hesse's 

 work, Recherches sur les Trematodes Marine. 



In the following notes I record a few curious forms exhibiting some 

 peculiarities of structure which differ somewhat from those described in 

 previous papers on these organisms, published in Part III. of the Annual 

 Reports of the Fishery Board for Scotland for 1895, 1901, 1902, and 

 1904. I also give at the end of the present paper a list of all the species 

 recorded in these various Reports. 



TREMATODA. 



FAM. POLYSTOMATIDiE. 



Genus Phyllocotyle, van Benden and Hesse (1863). 

 Phyllocotyle gurnardi, van Beneden and Hesse. PI. vi., figs. 19 and 20. 



1863 Phyllocotyle gurnardi, v. Ben. and Hesse, Rech. sur les 

 Trem., p. 103, pl. x., fig. 1-7 (not Phyllocotyle gurnardi, T. 

 Scott in Part III. of the 19th Report, p. 147, pl. viii., 

 fig. 23). 



Under this name I record a species of Trematode found on the gills of 

 specimens of the Grey Gurnard (Trigla gurnardus, Lin.) from the Moray 

 Firth. 



The body of this Trematode is lanceolate, very flat, and moderately 

 slender at the anterior end, but becomes wider posteriorly ; the distal end 

 is rounded, and furnished on the ventral aspect with six marginal 

 suckers of moderate size and of a rather complicated structure — three 

 on each margin ; an elongated process, slender and narrow, and with 



