of the Fishery Board for Scotland. 305 
Habitat.—On cod, pollack, and other fishes. This appears to be the 
largest of the British Caligi, the carapace of some of my specimens 
measures 8 mm. in breadth. It is not so common as the next species. 
Caligus rapax, M. Edwards. 
1840. Caligus rapax, M. Edwards, ‘ Hist. Nat. Crust.,’ iii. p. 453, 
No. 6, t. 38, fig. 9. 
1850. Caligus rapax, Baird, ‘ Brit. Entom.,’ p. 270, pl. xxxii. figs. 
2, 3. 
Habiiat.—On various fishes, as the cod, saith, pollack, ore 
taken also with surface and bottom tow-nets. A common species. The 
young (Chalimus scombri, Burmeister) frequent on the lumpsucker. 
Caligus miillert, Leach. 
1816. Caligus miilleri, Leach, ‘Enc. Brit. Supp.,’ i. t. 20, fig. 68. 
1850. Caligus miilleri, Baird, loc. cit., p. 271, pl. xxxii. figs. 4, 5. 
Hatitat.—The abdomen of this species is decidedly shorter than that 
of Caligus rapax, the shape of the carapace is also more oblong. It 
does not appear to be very common. 
Lepeoptheirus pectoralis, Miiller. 
1776. Lernea pectoralis, Miiller, ‘Zool. Dan.,’ i, p. 41, t. 33, 
fig. 7. 
1832. Lepeoptheirus pectoralis, Nordmann, ‘ Mikr. Beitr.,’ ii, p. 30. 
1850. Lepeopthetrus pectoralis, Baird, loc. cit., p. 275, pl. xxxil. 
fig. 10. 
Habitat.—Adhering to the pectoral fins of the plaice ( Plewronectes 
platessa), frequent. Lepeoptheirus differs from Caligus by not having 
sucking disks on the frontal plates. 
Lepeoptheirus thompsoni, Baird. 
1850. Lepeoptheirus thompsoni, Baird, loc. cit., p. 278, pl. xxxiii. 
fig. 2 
Habitat.—On the gills of the turbot; frequent. In this species the 
thorax is larger and the abdomen longer than in the previous one. 
CECROPIDZ. 
Cecrops latreili, Leach. 
1816. Cecrops latreidliw, Leach, ‘Enc, Brit. Supp.,’ vol. i. t. 20, 
figs. 1-5. 
1850. Cecrops latreillit, Baird, loc. cit., p. 293, pl. xxxiv. figs. 1, 2. 
Hatlitat.—Attached to the gills of the short sunfish (Orthayoriscus 
mole) caught in the Forth, October 1890 (Andrew Scott). This species 
has been taken by Edward on the gills of both the short and oblong 
sunfish in the Moray Firth. Specimens of C, latredli, from the Forth 
are also in the Edinburgh Museum (E. Clark). 
Lemargus muricatus. Kroyer. 
1838. Lemargus muricatus, Kroyer, ‘Tid&skrift,’ vol. 1. p. 487, 
tT OPhps, AS BC, D 
1850. Lemargus muricatus, Baird, loc cit., p. 295, pl.- xxxiv. 
figs. 3, 4. 
Habitat.—Attached to cavities hollowed out of the flesh of a short 
sunfish caught in the Forth, October 1890 (Andrew Scott). It has 
also been recorded by Edward from the Moray Firth, from the same 
species of sunfish. Lemargus appears to be more restricted i in its habitat 
than nina 
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