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Part III. — Eighteenth Annual Report 



not greatly developed. Thoracic feet, four pairs, small but distinct, and 

 situated immediately behind the cephalic lobe. Neck short and moder- 

 ately slender. Genital segment, moderately large and slightly sigmoid. 

 Ovisacs elongated, slender, and twisted, as in Lerncea branchialis. 



Habitat. — On the gills of the speckled goby (Gobius minutus). 



Remarks. — Our superintendent, Dr. T. Wemyss Fulton, while examin- 

 ing some small fishes sent to the Laboratory from the Solway during 

 November 1899, observed a small Lemma on the gills of a specimen of 

 Gobius minutus. This he kindly handed over to me along with a con- 

 siderable number of specimens of the same species of goby. On making a 

 careful examination of all these specimens — about 134 in number — three 

 more specimens of the Lerncea were obtained; making in all four specimens 

 of this parasite from 135 fishes, or about 3 per cent. 



The average length of the specimen figured, exclusive of ovisacs, is a 

 little over 7mm. 



I have not been able to find any previous record of this small Lerncea, 

 and have therefore described it as a new species under the name of 

 Lerncea minuta. 



Genus Hcemobaphes, Steenstrup and Liitken. 



Hcemobaphes cyclopterinus (Fabr.). (PI. VII., fig. 14.) 



1780. Lerncea cyclopterina, Fabr., Fauna Grcenl., p. 337. 



1861. Hcemobaphes cyclopterina, Stp. and Liitk., Bidrag til 



Kundskab, p. 405, PI. XIII., fig. 30. 

 1891. Hcemobaphes cyclopterina, T. Scott, Ninth Ann. Rept. 



Fish. Board Scot., Pt. III., p. 310. ' 



I have only seen two specimens of this curious Lernsean, and both were 

 found on the gills of the pogge, Agonus cataphractus. One was obtained 

 at Dunbar by Mr. Jamieson, Laboratory Assistant, in April 1891, on the 

 gills of a pogge taken from the stomach of a cod ; the other was taken 

 also from the gills of a pogge captured by the " Garland " in the Firth of 

 Forth in February 1892. This specimen was recorded in the Annals of 

 Scottish Natural History for April of the same year. It is represented 

 in the present paper by figure 14 on Plate VII.; the neck and upper part 

 of the thorax of this specimen was accidentally damaged. 



I have recently examined a large number of pogges without finding a 

 single example of this Hcemobaphes ; probably the species is a rare one. 



Hcemobaphes ambiguus, sp. n. (PI. VII., fig. 15.) 



A HcemobaphesAike parasite was found on the gills of a specimen of 

 the spotted dragonet, Callionymus maculatus, captured in the Solway in 

 October 1899. 



This parasite differs from Hcemobaphes cyclopterinus in having a very 

 short neck, and in the abdominal portion of the genital segment being 

 more produced ; moreover, this produced part is compressed and somewhat 

 dilated at the end, the margins are somewhat irregular in outline, and the 

 lateral lobes are moderately prominent (fig. 15). Only one ovisac is 

 shown in the figure ; the other was accidentally destroyed. 



The entire length of the specimen figured is about the seven-twentieths 

 of an inch (ll-5mm.). 



I have been unable to find any published description of this form ; and 

 as it agrees with Hcemobaphes in some of its more prominent characters, 

 I have decided to regard it for the present as "new." 



