368 Proceedings of the llotjal Physical Society. 



Onos tricirrattos, captured at DuDbar in 1892. In this species 

 the fourth pair of feet are niore rudimentary than in typical 

 Caligus. 



Genus (122) Lepeophtheirus, Nordmann, 1832. 

 279. Lepeophtheirus pect oralis (0. F. Miiller). 



1776. Lerncea pedoralis, Miiller, Zool. Dan. Prodr., vol. i. p. 41, 



pi. xxxiii. fig. 7. 

 1850. Lepeophtheirus pedoralis, Baird, Brit. Entom.,p. 275, pi. xxxii. 



fig. 10. 

 1900. ,, „ T. Scott, Eighteenth F. B. Kept, 



pt. ill. p. 150, pi. V. figs. 26-31. 



Hah. — Frequent under the pectoral fins of Plaice, Flounders, 

 and Dabs. 



280. Lepeophtheirus Thompsoni, Baird. 



1850. Lepeophtheirus Thompsoni, Baird, Brit. Entom., p. 278, 



pi. xxxiii. fig. 2. 



1900. ,, ,, T. Scott, I. c., p. 152, pi. v. 



figs. 43-45. 



1900. ,, obscurus, idem, I.e., p. 153, pi. vi. figs. 16-19. 



Hah. — Frequent on the gills of Turbot, Bothus maximits, 

 captured off St Monans. The form I referred doubtfully to 

 L. obscurus, Baird, appears to be identical with L. Thompsoni; 

 it is sometimes common on the gills of the Brill, Bothus 

 rhomhus. 



281. Lepeophtheirus pollachii, Bassett- Smith. 



1896. Lepeophtheirics pollachii, Bassett-Smith, Ann. and Mag. Nat. 



Hist. (6), vol. xviii. p. 12, pi. iv. 



fig. 1. 

 1900. ,, ,, T. Scott, op. cit., p. 153, pi. vi. 



figs. 9-15. 



Hah. — Firth of Forth, on the gills of Lythe, Gadus pol- 

 lachius, 8th February 1895; apparently not very rare. 



