ENTOMOSTRACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 529 
Genus Undinula, A. Scott, 1909. 
Syn. Undina Dana (name preoccupied). 
Undinula vulgaris (Dana). 
1849, Undina vulgaris, Dana, op. cit., vol. ii. p. 18. 
1892, Calanus __,, Giesb., /. Fl. Neapel, vol. xix. p. 92, pl. vi. fig. 11; pl. vii. fig. 2 e¢ seq. 
This species was observed in surface tow-net gatherings from a considerable number 
of stations, extending from Station 8, in 26° 12’ N., 20° 25’ W., to Station 82, in 
20° 40’ 8., 38° 20’ W. Both males and females were obtained. The structure 
of the fifth pair of thoracic legs in the male of this and the following species is so 
remarkable and so entirely different from those of the typical Calanus, that, as indicated 
by G. O. Sars, the position of these two species in the genus Calanus can scarcely be 
maintained. Dana ascribed the species named above to the genus Undina, but 
unfortunately that name was already occupied by GouLp and also by Munstsr, and a 
modified form of the name was therefore adopted for the genus by my son in his Report 
on the Copepoda of the Siboga Expedition. 
Undinula darwinw (Lubbock). 
1860, Undina darwinit, Lubbock, Trans, Linn. Soc. Lond., vol, xxiii. p. 7, pl. xxix. 
1892, Calanus »  Giesb., &. Fl, Neapel, vol. xix. p. 91, pl. vi. fig. 5 et seg. 
1909, Undinula _,, A. Scott, “ Siboya” Haxpeditie, ‘‘ Copepoda,” p. 17. 
Several specimens, chiefly females, were obtained in a surface tow-net gathering 
collected 4th May 1904 in 34° 43’8., 17° 15’ E., Station 476. ‘This species is a true 
Undinula. 
Fam. HUCALANIDA. 
Genus Hucalanus, Dana, 1852. 
Eucalanus attenuatus, Dana. 
1849, Calanus attenuatus, Dana, op. cit., vol. ii. p. 18. 
This species occurred in samples from only five stations, all in the North Atlantic, 
viz., Stations 11, 12, 14, 20 and 26, 23° 50’ N., 21° 34’ W., to 14° 33’ N., 25° 9 W. 
Eucalanus crassus, Giesbrecht. 
1888, Hucalanus crassus, Giesb., Atti Acc. Lincei Rend., ser, 4, vol. iv. p. 333. 
1892, Fe 5 idem, F. Fl. Neapel, vol. xix. p. 132, pl. iv. fig. 9 et seq. 
This Hucalanus was obtained sparingly in two surface gatherings—one collected at 
Station 19, in the North Atlantic, 19° 12’ N., 24° 08’ W., the other at Station 68, in the 
South Atlantic—Pernambuco Lighthouse, bearing 7° 42’ 8., 34° 32’ W, 
TRANS. ROY. SOC. EDIN., VOL. XLVIII., PART III, (NO. 24). 79 
