148 EEPOET ON THE PELAGIC COPEPODA 



males taken by Claus in Heligoland and the Mediterranean point to 

 their being in fact two distinct species^ but the facts given above 

 support the conclusion that the characters taken by Giesbrecht as 

 specific are liable to great variation, and that his three species, D. 

 longiremis, D. hifilosus, and JD. discaudatus are, in fact, varieties of 

 one species, viz. Bias longiremis, Lilljeborg. 



5. Temora longicornis, 0. F. Muller. 



Temoea finmaechica, Claus. Freileb. Copepod., p. 195. 



— lONGiCOENiS, Brady. Monogr. Brit. Copep., i, p. 54. 



— — Canu. Les Copep. libres marins du Boulonnais, Bull. Sci. 



de la France et Belg., iii ser., 1 ann., p. 89. 



— — Giesbrecht. Freileb. Copep. der Kieler Foehrde, Nacbtrag. 

 Haiitemoba LONGICOENIS, Giesbrecht. Ibid., p. 149. 



— — I. C. Thompson. Proc. Liv. Biol. See, vol. i, p. 35. 



This very common species was found sparingly during the winter 

 months at Plymouth ; its numbers increase greatly in April, and 

 appear to reach a maximum in August and September. Thompson, 

 in adopting the generic name Halitemora, overlooks Giesbrecht^s 

 appendix in which the latter gives way to the priority of Claus' 

 name Temora (Claus, Sitz. der Kais. Akad. Wien, Ixxiii, 1881.) 



6. Centropages typicds, Kroyer. 



ICTHTOPHOEBA DENTICOENIS, Claus. Freileb. Copepod., p. 199, Taf. xxxv, figs. 1, 



3—9. 

 Centbopages TTPlcug, Brady. Monogr. Brit. Copep., i, p. 65, pi. viii. 



— — Canu, Les Copepodes libres, &c.. Bull. Sci. de la France 



et de la Belg., iii ser., 1 ann., p. 96. 



Taken in great abundance in summer, autumn, and spring, but it 

 appears to be less abundant in the winter months. 



7. Parapontella brevicornis, Luhhoch. 



Paeapontella BEEVICOENIS, Srad'j/. Monogr. Brit. Copep., 5, p. 69, pi. ix, figs. 1—6. 

 — — I. C. Thompson. Copep. Liv. Bay, Proc. Liv. BioL 



Soc, ii, p. 65. 



I have only found this species on two occasions, and then in small 

 numbers, viz. on August 81st, 1888, near the Eddystone Lighthouse, 

 and on March 21st, 1889, in the Cattewater. 



