BOMOLOCHUS SOLEiE. 39 



water they will be seen swimming or running about with 

 nearly as much agility as a "free-swimming" species. It is 

 fairly evident therefore that the presence of these Copepods 

 in the nostrils of fishes is a matter of choice, and there is 

 nothing to show that their presence is the cause of much 

 inconvenience to the fish. Moreover, in this situation there 

 are two points in favour of the Copepod — it has plenty of food 

 of a kind, and it is well sheltered from its enemies. 



The male does not differ much from the female except that 

 the second maxillipeds are armed with more powerful 

 terminal claws. 



2. Bomolochus onosi T. Scott. 



(Plate I, fig. 4 ; Plate III, figs. 5-7.) 



1902. Bomolochus onosi T. Scott. (114) p. 289, pi. xiii, figs. 19-22. 



Female. — Body elongated, subpyriform ; the an- 

 terior segment proportionally larger than the same 

 segment in Bomolochus soleas, being equal to nearly 

 half the entire length of the cephalothorax ; the next- 

 three segments subequal in length, but each narrower 

 than the one that precedes it. Abdomen narrow and 

 moderately elongated, genital segment twice the 

 length of the next one, other segments smaller, but 

 the anal rather longer than either of the two preced- 

 ing segments. Caudal rami about as long as the anal 

 segment. 



Antennules moderately stout, but becoming some- 

 what attenuated towards the distal extremity ; the 

 first two joints tolerably large, the second being about 

 one and a half times the length of the next, the third 

 and fourth joints subequal and larger than those 

 which follow, the penultimate joint smaller than any 

 of the others ; the plumose setae with which the anten- 

 nules are furnished, though somewhat similar to those 

 on the antennules of Bomolochus solese, are apparently 

 not quite so stout. Antenna?, mandibles, and maxilla? 

 somewhat similar to the same appendages in Bomo- 

 loch us sol ex. Second maxillipeds robust, and each armed 

 with a tolerably stout and strongly curved terminal 

 claw : a slender seta also springs from the distal end 



