39 
Pseudocaligus brevipedes (Bassett Smith). 
Found attached to the inner side of the operculum of 
the three bearded rockling, Onus tricirratus. This genus 
is distinguished from Caligus, its nearest ally, by the 
structure of the fourth pair of feet, which have no 
exopodite. 
Lepeophtheirus pectoralis (Muller). 
Our experience of this species is that it occurs more 
frequently on the flounder than on any other member of 
the Pleuronectidie. The pectoral and pelvic fins often 
have their under surfaces covered with this parasite; on 
one occasion thirty-two adult females were counted 
adhering to a pectoral fin. Males and immature females 
appear to be more common on the general surface of the 
fish. 
Lepeophtheirus nordimanne (M. Edwards). 
This is one of the larger species of Lepeophtheirus, and 
sometimes measures half an inch in length. It is found 
on the short sun-fish Orthagoriscus mola. 
Lepeophtheirus hippoglossi (Kroyer). 
Found generally distributed on the surface of halibut, 
occasionally in considerable numbers. On the * white ” 
side of one specimen we have counted 100 individuals, but 
that was on a fish in the Aberdeen fish market. 
Lepeophtheirus stromi (Baird). 
Frequently found on the salmon captured in the 
estuaries. Its black metallic lustre makes it a con- 
spicuous object on the bright scales of the fish. 
Lepeophtheirus obscurus, Baird. 
From the gills and inner surface of the operculum, 
and under the pectoral fins of the brill. It is probable 
that this species may only be a form of L. thompsona, 
Baird, which is found on the gills of the turbot. 
