44 PSEUDOCALANUS. 



off Loup Head ; Dingle Bay ; near Valentia ; Rockall 

 Bank; in lat. 51 22' N., long. 12 25' W., and lat. 

 53 24' N"., long. 15 24' W. I have myself taken it, 

 though very sparingly, in the surface-net amongst 

 the Scilly Islands. 



It may be noted here that in most of the Calanidse 

 the apical spines of the outer branches of the swim- 

 ming feet afford excellent distinctive characters, and, 

 on this account, are carefully figured in the plates. 

 The first swimming foot is, however, usually, if not 

 always, destitute of a spine, its place being occupied 

 by a stout hair or seta. 



Genus 3. PSEUDOCALANUS, Boeck (1872). 



(Pseudocalanus, Boeck, Nye Slsegter og Arter af Saltvands-Copepoder, 

 1872. Clausia, Boeck, 1864. Calanus, Brady, 1865.) 



Like the preceding except in the structure of the 

 feet, which are composed as follows. The outer branch 

 of the first four pairs is always 3-jointed ; in the first 

 pair the inner branch consists of only one joint, in 

 the second of two, in the third and fourth of three 

 joints. The fifth pair of feet in the female are alto- 

 gether absent ; in the male they form two very slender 

 limbs, 5-jointed on the right, 3-jointed on the left side. 



The term Clausia, at first proposed by M. Boeck for 

 this genus, had been previously used by Claparede for 

 a genus of parasitic Copepoda. It was, therefore, in a 

 later publication, withdrawn by M. Boeck, the desig- 

 nation Pseudocalanus being substituted. 



