288 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



number of the ova, the specimens agree with Distomum 

 oculatum of Levinsen.* But the so-called eye spots of the 

 latter species are not represented in my specimens, and 

 the size of the ventral sucker and the presence of a 

 distinct armature in Levinsen's species render it unlikely 

 that the specimens here described are D. oculatum. 

 Several specimens from Bairdiella chrysura described by 

 Lintont shew a greater resemblance, but these distomids, 

 too, do not appear to have been identified with any known 

 species. 



Derogenes various, (0. F. Midler). 



From pyloric part of stomach of Whiting (Gadus 

 merlangus) " shoals," off Cumberland coast, April, 1906. 



About half-a-dozen small trematodes were obtained 

 from the above host. The worms were dull red in colour 

 when alive. The figure (fig. 18) is constructed from 

 observations made on the living worm. 

 The principal dimensions are : — 

 Total length : 2 to 25 mm. ; 

 Greatest breadth : 0'56 mm. ; 

 Diameter of oral sucker : 0*2 to 0*27 mm. ; 

 Diameter of ventral sucker : 0*4 to 0*43 mm. ; 

 Diameters of ova : 0*055 x 0*03 mm. 

 The body is cylindrical, or very slightly flattened. 

 The greatest breadth is in the region of the ventral 

 sucker, where it is about one-fourth of the total length. 

 From this region the body tapers in both directions and 

 the posterior end is usually slightly more pointed than 

 anteriorly. The skin is quite smooth and possesses no 

 spines. 



The ventral sucker is rather variable in diameter, 



* Loc. cit. 



f Bull. Bureau of Fisheries, Washington, vol. 24, 1904, pi. 23, 

 figs. 168, 169. 



