of the Fishery Board for Scotland. 3 235 
DESCRIPTION OF SPECIES. 
CRUSTACEA. 
1. COPEPODA. 
Family CaLanipD4&. 
Genus Paracalanus, Boeck (1864). 
Paracalanus parvus (Claus). 
1863. Calanus parvus, Claus (13),* p. 173, pl xxvi. figs. 
10-14; pl. xxvii. figs, 1-4. 
1864. Paracalanus parvus, Boeck (5), p. 232. 
1892. Paracalanus parvus, Canu (11), p. 169. 
1893. Paracalanus parvus, I. C. Thompson (33), p. 7, pl. xv. 
fig. 5. 
1894. Paracalanus parvus, T. Scott (30), p. 26, pl. 1. figs. 1-19. 
Habitat.—Kast of May Island, in a surface tow-net gathering. Frequent. 
Off St Monans. Not common. 
Paracalanus parvus is easily distinguished from any other species of 
the British Calanide by the structure of the fifth pair of thoracic 
feet in both sexes. The only other British record for this species seems 
to be that of I. C. Thompson in the ‘Copepoda of Liverpool Bay.’ The 
distribution of the species appears to be world-wide; it has been re- 
corded from the North Sea, from the Atlantic (North and South), from 
the Mediterranean, and from the China Sea. 
Genus Acartia, Dana, 1846. 
Acartia clausi, Giesbrecht. 
1889. Acartia clausi, Giesbrecht (17), p. 332. 
1890. Acartia clausi, Canu, (10a), p. 326, pl. xxiv. 
1893. Acartia clausi, I. C. Thompson (33), p. 8, pl. xv. fig. 6. 
1894. Acartia claust, T. Scott (30), p. 67, pl. vii. figs. 33-40. 
Habitat.—Several parts of the Forth area. One of the chief characters 
that distinguish this species is the form of the fifth pair of thoracic feet. 
The fifth pair in the female are each armed with a stout and compara- 
tively short apical spine in addition to the plumose seta. The following 
forms of Acartia are also obtained in the Firth of Forth, viz. :—Acartia 
longiremis (Lillj.), generally distributed, especially in the estuary proper. 
Acartia discaudata, Giesbrecht, off Musselburgh. Acartia bijilosus, Gies- 
brecht, West of Queensferry. 
Family Ps—uDocYCLOPIIDA, nov. family. 
Body comparatively robust. Anterior antenne short, sixteen. to 
seventeen-jointed. Alike on both sides in the male, and similar to those 
of the female. Mouth organs and swimming-feet like those of the 
Calanide. Fifth pair in the female simple, one-branched, and two-jointed ; 
* The numbers in parentheses correspond with the numbers in the Bibliographical 
list at the end of the paper. 
