26 ANNALS OF SCOTTISH NATURAL HISTORY 



COPEPODA continued. 



ist Visit, 2nd Visit, 3rd Visit, 

 July 6. July 13. Aug. 24. 



*Delavalia palustris, Brady . . . n.c. 



Canthocamptus staphylinus (Jurine) . .n.c. c. c. 



j/iimitus, Claus . . . n.c. n.c. n.c. 



inornatus, T. Scott . . r. n.c. n.c. 



hirticorniS) T. Scott . . c. 



crassus, G. O. Sars . .n.c. c. n.c. 



! pygmcziis, G. O. Sars . . n.c. c. n.c. 



zschokkei, Schmeil . . r. n.c. 



Moraria anderson-smithi, T. and A. Scott . n.c. 



poppei (Urazek) .... n.c. 



* Laophonte curticauda, Boeck . . . n.c. 



*Nannopus pahtstris, Brady ... n.c. 



* Platychelipus littoralis, Brady . . . n.c. 



'Dactylopus tisboides, Claus . . . n.c. 



The species marked thus ('*), though occasionally found in the 

 open sea, are usually more frequent in pools and estuaries where 

 there is a large admixture of fresh water. The following remarks on 

 some of the species may be of interest : 



Tachidius littoralis was described and figured in part iii. of the 

 "Tenth Annual Report of the Fishery Board for Scotland," 1892, 

 as a new species under the name of Tachidius crassicornis, but I sub- 

 sequently learned that it had been described by Dr. S. A. Poppe in 

 1 88 1 under the name which it now bears. It is readily dis- 

 tinguished from Tachidius brevicornis (Mull.) by the short stout 

 antennules, which terminate so abruptly that they look as if their 

 ends had been snipped off; the fifth thoracic feet are also narrow 

 and quite unlike the two big, almost semicircular plates that form 

 the fifth feet of T. brevicornis. 



Canthocamptus mimitus is a small species, and apparently 

 widely distributed. When viewed laterally, the principal tail 

 setae seem to spring from beneath the overlapping short furcal 

 joints ; from above, the minute bristles that fringe the anal oper- 

 culum are bifid, and by these two characters alone the species may 

 be distinguished. 



Canthocamptus inornatus was first observed in Rescobie Loch, 

 Forfarshire, and has since been found in various other parts of 

 Scotland and also in England. This species may be distinguished 

 by the moderately long and tapering furcal stylets. 



Canthocamptus hirticornis is found most frequently in pools and 

 lochans near the sea coast, but not necessarily in brackish water. 



