2 Mr. P. W. Bassett-Smith on some 



may be roughly divided into two classes — the blood-suckers 

 and the nvacus-eaters. Of the former are here described 

 species of Lernanthropns, Peroderma, and Lernceonema ; the 

 last, as exampled by L. pohjnemi^ must indeed cause a 

 great amount of irritation and trouble to its host, being found 

 in such numbers on a single fish and burrowing so deeply 

 into the flesh : the second group includes the "Caligidae," with 

 Bcviohchus, Brachiella, Chondr acanthus, &c. The species 

 of Caligvs were seen very actively moving about in the gill- 

 cavity or on the surface of the fish, rarely causing any trouble ; 

 the latter two fixed, but not deeply, the long neck of 

 Brachiella and Anchorella. being seen twisting about so as to 

 ap]ily the head to different spots as wanted. The manner in 

 which the free-swimming embryos find their respective hosts 

 is not known and is curious to think of. On the tail of one 

 Caranx Rotderi 1 found some half-dozen specimens of an 

 immature Cab'gus attached by the frontal filament. 



I have as far as possible followed Gerstaecker's system ; 

 but there is a great deal of discrepancy between the various 

 authors, and in some the plates and descriptions are very 

 meagre. The cliaracter of the antennae, which would seem 

 to be a feature on which " generic " classification might be 

 based or assisted, is in Ler7ianfhropiis quite lost, for lleller 

 represents all his specimens with two-jointed anterior antenna 

 (if correctly figured and described), whereas Kroyer's and my 

 sjiccimcns invariably have six- or seven-jointed antennae, 

 which is, I believe, the normal form. The y^euus Bomoloch us 

 might well be divided into two subgenera — first, those with 

 elongated rostrum and anterior antenna) provided with long 

 bristles, as B. megaccro/i, Heller, and B. triceros, sp. n.; and 

 second, those with short rostrum and anterior antennae un- 

 ])rovided with bristles, as in B. gracilis^ Heller, B. tetra- 

 do7iis, &c. 



I have been forced to create a new genus — IJeUeria — for 

 a species of the family Dichclcsthina taken from the gills of 

 Cyhium guttatunif which, though closely connected with 

 Heller's VseudocycnuSj yet is, I think, distinct. 



Finally, I may sav that for preservative purposes, though 

 a solution of formol keens the soft-bodied specimens well, 

 yet it has a tendency to blacken the chitinous- coated ones, as 

 Caligus &c. 



Ergasilidae. 

 Bomolochus triceros, sp. n. (PI. I. fig. 1.) 

 Many specimens of this species were takeu at Bombay from 



