266 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 
XXXII. 
NOTES ON CECROPS LATREILLIT, LEACH, AND 
LAUIMARGUS MURICATUS, KROYER. | 
BY ANDREW SCOTT. 
[Read 25th November, 1890.] 
THE two species of fish-parasites under notice were 
found on a specimen of the Short Sunfish (Orthagoris- 
cus mole), about 4 feet in length, which was captured 
near Inchkolm, in the Firth of Forth, on 10th Cerone 
last. 
Cecrops latreillit, which was Fayretel adhering fo the 
gills of the fish, seems to be of frequent occurrence on 
O. mole. It is mentioned by Baird, in his History of 
the British Entomostraca, as having been found in a 
number of localities, and he states that “in all in- 
stances they were taken from the Sunfish and adher- 
ing to the gills.” White, in his Popular History of 
British Crustacea, says that “it is found on the gills 
of the Sunfish occasionally caught on the coasts of © 
England and Ireland.” Edward of Banff also re- 
corded it from the Moray Firth, where it was taken 
on the gills of the Oblong Sunfish (Orthagoricus 
oblongus) as well as on those of O. mole. 3 
Lemargus muricatus was found in two hollows 
which it had eaten inwards through the skin of the 
fish. One of the hollows was in front and the other 
behind the anal fin. The species appears to be gre- 
garious in its habit, as a number of specimens were 
occupying each hollow. They adhered to the flesh 
of the fish by means of the strong hooks of the 
foot-jaws, so that it was somewhat difficult to detach 
them without injuring them. This species is men-— 
tioned by Baird and White. Edward also records 
it from the Moray Firth, but it does not appear to 
be so common as Cecrops latreillit. 
Lemargus differs from Cecrops in the feet being 
foliaceous and branchial, and the upper segments of 
the thorax are also small but distinct. 
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