of the Fishery Board for Scotland. 



167 



sometimes on the under side of the tongue and the inside of the gill- 

 covers. Qhondracanthus merluccii differs from the other species in having, 

 oesides its usual thoracic limbs, a pair of moderately long appendages near 

 the middle of the posterior portion of the thorax, and also in the postero- 

 lateral processes being considerably elongated. The mandibles, which are 

 distinctly toothed on the upper margin, and the other cephalic appendages 

 are all more or less similar to the same appendages in other species of 

 Chondracanthi. 



A female specimen of average size measured about half an inch in 

 length, exclusive of ovisacs. The males are very small, and sometimes 

 more than one of them may be observed sticking on a female. The 

 species varies to some extent both in its general outline and in the pro- 

 portional lengths of the various appendages. 



Chondracanthus lophii, Johnston. 



1836. Chondracanthus lophii, Johnston, Loud. Mag. Nat. 



Hist, p. 81, fig. 16. 

 1850. Lernentoma lophii, Baird, op. cit., p. 330, PI. XXXV., 



%. 3. 



This is one of the more common of the copepod parasites of fishes ; 

 it seems to be to a large extent peculiar to the angler, Lophius piscatorius, 

 and is usually found adhering to the inside surface of the gill-pouches. 

 A considerable percentage of the anglers captured by the " Garland " are 

 more or less infested with this copepod. I have records of it from the 

 Firth of Forth, the Firth of Clyde, and other parts of the Scottish coasts. 

 The oviferous tubes are slender, usually elongated, and more or less 

 twisted. 



Chondracanthus zeus, De la Eoche. (PL VIII., fig. 1.) 



1811. Chondracanthus zei, De la Eoche, Nouv. Bull, des Sc. de 

 la Soc. Philom., vol. ii., p. 270, PI. II., fig. 2. 



1850. Chondracanthus zei, Baird, op. cit., p. 327, PL XXXV., 

 fig. 1. 



In this species the dorsum is ornamented with a number of processes, 

 which gives the specimens a bizarre appearance not usually observed 

 amongst the Chondracanthi. 



I obtained a specimen of Chondracanthus zeus on the gills of a John 

 Dory, Zeusfaber, caught in the Firth of Forth in 1891; this specimen is 

 recorded in Part III. of the Tenth Annual Report of the Fishery Board for 

 Scotland (1892). A second specimen was obtained in the Firth of Forth 

 in 1896, also on the gills of a John Dory. Chondracanthus zeushas also 

 been obtained in. the Firth of Clyde, on a John Dory, captured there by 

 the " Garland." 



The length of the specimen represented by the figure was about half 

 an inch, but the species varies to some extent both in size and 

 ornamentation. 



Chondracanthus limandce, Kroyer. (PL VIL, figs. 38-40.) 



1864. Chondracanthus limandce, Kr., op. cit., r. iii., vol. ii., 

 pp. 322 and 330, PL XIV., fig. 2. 



Kroyer obtained this species on Platessa limanda (Pleuronectes 

 limanda, Linn), the common dab. I have obtained on two different 

 specimens of the common dab what appears to be the same species of 

 copepod. The common dab from which the specimen represented by the 



