MAEINE BIOLOGICAL STATION AT PORT EEIN. 43 



COPEPODA. 



In the last report mention was made of a new copepod 

 found by Mr. I. C. Thompson in dredged material taken 

 outside Port Erin at 15 fathoms. This has since been 

 described by Mr. Thompson (" Trans. Liverpool Biol. 

 Soc," Vol. IX., p. 26, Pis. VI. and VII.) as Pseudocyclopia 

 stephoides. 



It was by no means easy to decide in which genus to 

 place this well-marked species, as it has strong points of 

 resemblance in common with the three genera, Pseudo- 

 calanus, Stephos, and Pseudocyclopia. With Pseudocy- 

 clopia it agrees in all points excepting in the number of 

 joints in the anterior antennae, and the primary branch of 

 the posterior antennae, and as in general appearance and 

 in the first four pairs of swimming feet it strongly resem- 

 bles Pseudocyclopia it was decided provisionally to place 

 it in that genus. Its fifth pair of feet, however, are more 

 like those of Stephos. In the "Twelfth Annual Keport 

 of the Fishery Board for Scotland " Mr. Thomas Scott 

 added a new species belonging to this genus recently 

 found by him in the Forth area. As the genus Pseudo- 

 cyclopia forms a sort of missing link between the families 

 Calanidae and Misophriidae, Mr. Scott has wisely consti- 

 tuted a new family, the Pseudocyclopiidae, for its reception. 

 The species of Pseudocyclopia described by him having 

 respectively sixteen and seventeen joints in the anterior 

 antennae, he has made that number a family character. 

 The species here described has, however, twenty joints 

 in the anterior antennae, and as it otherwise agrees in all 

 respects with the family characters of Pseudocyclopiidae 

 Mr. Thompson suggested that the words "sixteen to 

 seventeen jointed" be altered to "sixteen to twenty 

 jointed" as a character of this new family, with which 

 Mr. Scott at once concurred. 



