ENTOMOSTRACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 569 
Oithona minuta, T. Scott. 
1894, Otthona minuta, T. Scott, Trans. Linn. Soc., Ser. 2, * Zool.,” vol. vi. p. 90, pl. ix. figs. 14-25. 
This somewhat rare form was observed in only a single plankton sample collected 
at Station 66 in 7° 09’ S., 34° 30’ W.—that is, between two of the stations where 
Calanopia americana, Dahl, was obtained. ‘lhe specimens from which the species was 
described were obtained in Bananah Creek, at the mouth of the river Congo, and in 
Loanda Harbour. 
Oithona similis, Claus. 
1866, Ozthona similis, Claus, Die Copepoden fauna von Nizza, p. 14. 
1902, _ ,, »  Giesh., Expéd. Antarct. Belge (1897-1899), “Copepoda,” p. 28. 
The only stations where this species was met with were 102 and 116, in 36° 31'S, 
51° 56’ W., and 49° 35’ 8., 57° 40’ W. respectively ; Station 116 was the last station 
but one before reaching the Falkland Islands. Ovthona similis was obtained in 
many of the plankton samples collected by the s.y. Belgica during its visit to the 
Antarctic in 1897-1899. These samples were collected between lat. 69° 48’ S. and 
lat. 71° 24’ S., and long. 81° 19’ W. and long. 89° 12’ W. The distribution of this 
species is very extensive, and it is usually of more or less frequent occurrence all over 
the North Sea, as well as in the North Atlantic. 
Fam. CycLopip&. 
Genus Cyclopina, Claus, 1863. 
Cyclopina belgice, Giesbrecht. (Pl. I. figs. 2-13.) 
1902, Cyclopina belgice, Giesb., Expéd. Antarct. Belge, ‘‘Copep.,” p. 3, pl. vii. figs. 1-15. 
A few specimens of a Cyclopina that agrees generally with Cyclopina belgice, 
Giesbrecht, were obtained in one of the gatherings collected by the Scotia in Scotia 
Bay, South Orkneys, in June 1903; Station 325, 60° 43’ 42” S., 44° 38’ 33” W. 
In the female of this species, the antennules are composed of eighteen articulations ; 
the first three joints are tolerably large, and do not differ greatly in size, but the 
second is rather smaller than the one on either side; the next three are very short, 
more so than any of the others; the seventh and eighth are larger; the remaining 
ten joints are small, but the last two are rather longer than those immediately 
preceding (fig. 3). 
The end joint of the posterior antenne is provided with several geniculated sete 
at its apex, and there are also one or two sete near the middle of the upper margin; the 
end joint is about twice as long as the third, while the third is rather longer than the 
second (fig. 4). 
The mandibles have their masticatory edge truncated and armed with several 
tolerably large teeth (fig. 5). 
The other mouth organs and the swimming feet do not differ very much from those 
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