492 WILLIAM NICOLL. 



Genus BUCEPHALUS Baer. 



Bucephalus minimus (Stossich). 



—Gasterostomum minimum Stossich, 1887, p. 96. 



About two dozen specimens of a small Gasterostome were found in the 

 intestine of Labrax hipus. They correspond in most respects with 

 Stossich's description of Gasterostomum, minimum from the same host, 

 but the position of the testes and the extent of the uterus are different. 



It is a small plump form reaching a length of a little over 1 mm. The 

 outline is oval and the maximum breadth is about half the length. The 

 anterior sucker is terminal and is surrounded by a circle of six highly 

 contractile tentacles. When extended these tentacles may be long and 

 almost filiform. When completely retracted they are almost impossible 

 to discern. In a semi-contracted state they appear as small, f.eshy, 

 knob-like protuberances. 



The ovary lies on the right side of the pharynx, which is situated 

 about the middle of the body. The testes lie directly behind the pharynx. 

 They are obUque and overlap each other considerably. The uterus fills 

 up a large part of the body, extending forward as far as the level of the 

 anterior sucker. The ova measure •022--024 x -OIS-'OIS mm. 



Genus RHIPIDOCOTYLE Diesing. 



Rhipidocotyle minima (Wagener). 



=Gasteroto7num triglae (van Ben.), Nicoll. 



This species was met with in the intestine of the gurnards, Trigla fini, 

 T. gurnardus, and T. hirundo. In the last-named it occurred also in the 

 pyloric caeca. The parasite was not found in the half-dozen specimens 

 of Trigla lyra which were examined. 



The only note which may be added to my previous description (Nicoll^ 

 1909, pp. 23-4) is that in this species the excretory vesicle is of great length 

 and extends a considerable distance in front of the ventral sucker. It 

 even reaches further forward than the fundus of the stomach. 



Several specimens of what appeared to be this species were met with 

 in the intestine of Trachinus vipera. They agree in every pai-ticular 

 except that the pharynx is situated further back. It is constantly 

 behind the middle of the body, and may even be found as far back as the 

 anterior end of the cirrus-pouch. Its relation to the other organs is 

 consequently very variable. Sometimes it is on the level of the anterior 

 testis. The only other noticeable feature is that the anterior sucker and 

 the pharynx are less unequal in diameter than is the case in typical 



