10 Dr. \V. NicoU on the 



the West-Coast specimens agree with my first specimen and 

 differ correspondingly from Looss's description of Dislomum 

 afacre. They agree with the latter more closely in having 

 the yolk-glands extending forward to tlie pharynx and the 

 genital aperture slightly displaced from the middle line 

 towards the left. 



Stephanochasmus baccatus, Nicoll. 



One specimen of a Stephanochasmus species was found in 

 the intestine of Cottus scorpius, and although it does not 

 entirely agree with my previous description of 8t. baccatus *, 

 it is the only species to which it can be referred. The most 

 important point serving for identification is the fact that it 

 possesses 28 cephalic spines in each row. Those of the 

 anterior row are shorter than those of the posterior row, but 

 tiieir length is somewhat variable. The cuticular spines 

 seem to be absent from a great part of the dorsal surface of 

 the body. 



The length of the specimen is 2*4: mm. ; greatest breadth 

 •7 mm. The neck is 1 mm. long, which is considerably 

 greater than in the first specimen, but may be accounted for 

 by assuming a greater degree of extension. Tlie diameter of 

 the oral sucker is "18 mm., of the ventral sucker '31 mm. 

 The prepharynx is '22 mm. and the pharynx measures '20 X 

 •19 mm. All these figures agree well enough with those 

 already given. The testes are contiguous and have each a 

 diameter of about "3 mm. The second testis is about \ of the 

 body-length from the posterior end of the body. The ovary 

 is '17 mm. in diameter, lying immediately in front of the 

 anterior testis and "l: mm. behind the ventral sucker. It is 

 thus much nearer the sucker than in the previous example. 

 The yolk-glands are slightly more extensive than before, but 

 do not reach the level of the ventral sucker. Tlie cirrus- 

 pouch is comparatively short and does not extend beyond tlie 

 ventral sucker to a greater distance than the diameter of the 

 sucker (?'. e. not more than jL of tiie body-length). The ova 

 are larger than before, measuring '101 X '046 mm. 



The specimens both from Hippoglossus and from Cottus 

 were found in gut which had been preserved in formalin and 

 not examined for parasites till some time afterwards. There 

 was thus no opportunity of getting them in a properly 

 extended condition, and this probably explains the some- 

 what different appearance which they present. 



♦ Ann. & Mag. Nat. Hist. (7) xix. pp. 80-83, pi. ii. figs. 5-7. 



