of the Fishery Board for Scotlarid. 
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 raj^ax, M. Edwards, 'Hist. Nat. Cmst.,' iii. p. 453, 
No. 6, t. 38, fig. 9. 
1850. Caligus rapax, Baird, 'Brit. Entom.,' p. 270, pi. xxxii. figs. 
2, 3. ■ 
Habitat. — On various fishes, as the cod, saith, pollack, lumpsucker, 
taken also with surface and bottom tow-nets. A common species. The 
young (Ohalimus scombri, Burmeister) frequent on the lumpsucker. 
Caligus miilleri, Leach. 
1816. Caligus millleri, Leach, * Enc. Brit. Supp.,' i. t. 20, fig. 68. 
1850. Caligus miilleri, Baird, loc. cit., p. 271, pi. xxxii. figs. 4, 5. 
Habitat. — 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 pedoralis, Miiller. 
1776. Lemma pedoralis, Miiller, ' Zool. Dan,,' i. p. 41, t. 33, 
fig. 7. 
1832. Lepeoptheirus jjedoralis, Nordmann, 'Mikr. Beitr.,' ii, p. 30. 
1850. Lepeoptheirus pedoralis, Baird, loc. cit., p. 275, pi. xxxii. 
fig. 10. 
Habitat. — Adhering to the pectoral fins of the plaice {Pteuronectes 
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, pi. 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. 
Cecropid^. 
Cecrops latreillii. Leach. 
1816. Cecrops latreillii. Leach, ' Enc. Brit. Supp.,' vol. i. t. 20, 
figs. 1-5. 
1850. Cecrops latreillii, Baird, loc. cit., p. 293, pi. xxxiv. figs. 1, 2. 
Habitat. — Attached to the gills of the short sunfish (Orthagoriscus 
moloe) 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. latreillii, from the Forth 
are also in the Edinburgh Museum (E. Clark). 
Lmmargus muricatus. Kroyer. 
1838. Loemargus muricatus, Kroyer, ' Tidsskrift,' vol. i. p. 487, 
t. 5, figs. A, B, C, D. 
1850. Lcemargus muricatus, Baird, loc cit., p. 295, pi. 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. Lcemargus appears to be more restricted in its habitat 
than Cecrops. 
u 
