304 Proceedings of the Royal Physical Society. 



Family Acartiid^e. 

 Genus (17) Acartia, Dana, 1846. 



27. Acartia longiremis (Lilljeborg). 



1853. Bias longiremis, Lillj., De Crust, ex ord. tribus in Scania 

 occurrentibus, p. 181, pi. xxiv. 



Hab. — Generally distributed throughout the estuary; not 

 usually uncommon, but at some seasons it appears to be 

 more numerous than at others. 



28. Acartia Clausi, Giesbrecht. 



1889. Acartia Clausi, Giesb., Atti Accad. Lincei Rend. Roma (4), 

 vol. v. sem. 2, p. 25. 



Hab. — The distribution and frequency of this species is 

 somewhat similar to the last. 



29. Acartia bifilosa, Giesbrecht. 



1881. Bias bifilosus, Giesb., Zoo). Anzeiger, vol. iv. p. 257. 



1882. ,, ,, Giesb., Die frei-leb. Copep. der Kieler Fohrde, 



p. 147, pi. iii. figs. 4, 22, 23 et seq. 



Hab. — Taken in the vicinity of Culross, near the head of 

 the estuary, in 1891. 



30. Acartia discaudata, Giesbrecht. 



1882. Bias discaudatus, Giesb., Die frei-leb. Copep. der Kieler 

 Fohrde, p. 148, pi. iii. figs. 4, 22, 23 et seq. 



Hab. — Collected with a tow-net between Portobello and 

 Cockenzie in 1890, and on several subsequent occasions, 

 chiefly in the same part of the estuary. The female of this 

 species is readily distinguished by the character of the f ureal 

 joints, which are of the form of broad flattened plates fringed 

 with stout and not very long setae. 



