266 TRANSACTIONS, NATLKAL HISTORY SOCIETY OF GLASGOAV. 



XXXII. 



NOTES ON CECROPS LATREILLII, LEACH, AND 

 L.EMARGUS 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 {OrthagoHs- 

 ciis molce), abovit 4 feet in length, which was captured 

 near Inchkohn, in the Firth of Forth, on 10th October 

 last. 



Cecrops latreilUi, which was found adhering to the 

 gills of the fish, seems to be of frequent occurrence ou 

 O. molce. 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 thej^ Avere 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 Avas taken 

 on the gills of the Oblong Sunfish {Orthagoricus 

 ohiongus) as Ave 11 as on those of O. molce. 



Lceinargiis muricatus was found in two hollows 

 which it had eaten inwards through the skin of the 

 fi.sh. 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. Edwai-d also records 

 it from the Moray Firth, but it does not appear to 

 be so common as Cecroj)S latreilUi. 



Lcemargus differs from Cecrops in the feet being 

 foliaceous and branchial, and the upper segments of 

 the thorax are also small but distinct. 



