182 BRITISH PAKASIT1C COPEPODA. 



Male. The male of this species is very small, being 

 scarcely more than half a millimetre in length ; the 

 cephalothorax, as in the male of Chondr acanthus 

 c.ornutus, is proportionally large ; the abdomen is small 

 and composed of two or three segments. Sometimes 

 more than one male may be found adhering to a female. 



Habitat. Parasitic on the hake (Merluccius vulgarin 

 Cuv.). Usually found clinging to the roof and sides, 

 sometimes on the under side of the tongue and on the 

 inside of the gill-covers. Frequently the head is either 

 buried in the tissues of the fish or enveloped in mucus. 

 This is a tolerably common parasite of the hake, and a 

 considerable number of specimens may sometimes be 

 obtained from a single fish. Coasts of Devon and 

 Cornwall ((?. Parker, Laughrin, -Bassett-Smith). Irish 

 Sea (A. Scott). Firths of Forth and Clyde, Aberdeen, 

 &c. (T. Scott). 



12. Chondracanthus ornatus T. Scott. 

 (Plate XLI, fig. 6 ; Plate XLY, fig. 7.) 



1900. Chondracanthus ornatus T. Scott. (112) p. 168 (description 

 only). 



1901. Chondracanthus ornatus idem. (113) p. 129, pi. vii, fig. 14 ( ? ). 



1902. Chondrucanthus ornatus idem. (114) p. 298, pi. xiii, fig. 



Female. When viewed from above with a general 

 outline closely similar to that of an equilateral triangle, 

 the bluntly-rounded head forming the apex, and the 

 truncated posterior end the base ; the front of the 

 head indistinctly trilobed, one bluntly-rounded lobe 

 being in the centre, and projecting slightly in front of 

 the two lateral lobes which are also bluntly rounded. 

 The neck connecting the head with the thorax very 

 short. Three or four, more or less distinct, tubercles 

 along each side of the thorax (forming the sides of the 

 triangle), a series of three similar tubercles extending 

 along the middle of the dorsum ; the posterior tubercle 

 of the middle series standing well up, but each of the 

 other two standing at a slightly lower elevation than 

 the one immediately behind. 



