ENTOMOSTRACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 549 
the second joint is of a broadly ovate form, its greatest width being equal to about 
half the length, and it carries four (or five) short setee round the lower part of the 
outer margin and apex, as shown in the drawing (fig. 30). 
Caudal rami short. 
Habitat.—Scotia Bay, South Orkneys; collected in June 1903; Station 325, 
60° 43’ 42” S., 44° 38’ 33” W. No males observed. 
Remarks.—As already stated, this species has a somewhat close resemblance to 
Tisbe minor (T. Scott), first described in the Annals of Scottish Natural History in 
October 1896, from specimens obtained in the Firth of Clyde. The same species has 
also been recorded from Norway by Professor G. O. Sars, and it was one of the 
Harpactids discovered by Dr Bruce in Franz Josef Land. But the Antarctic form, 
though closely resembling the northern species referred to, may be readily distinguished 
from it by the broadly ovate form of the second joint of the last pair of thoracic legs. 
The genus 7isbe, as Professor G. O. Sars remarks, “seems to be represented in all 
parts of the oceans,” and he has ‘‘even found one or two species of this genus in the 
Caspian Sea.”* Dr Girsprecut obtained two species belonging to the Jdyxa in the 
collections brought home from the Antarctic by the Belgica in 1899;+ both these 
species, however, differ in several respects from those observed in the material collected 
by the Scoteca ; and they differ especially in the structure of the first and fifth pairs of 
thoracic legs. I am also unable to identify the Scotia species with either of those 
recorded by Dr Brapy in his account of the Copepoda-Harpacticoida of the Deutsche 
Siidpolar Hupedition, pp. 560, 561. 
Tisbe gracilipes, new species. (PI. I. figs. 23-29.) 
Female.—The female of this species is somewhat like that of Zisbe gracilis (T. 
Scott) in its general form, being elongated and rather slender. 
The antennules are tolerably elongated; the second joint is rather longer than the 
third, which, in its turn, is about one and a half times the length of the fourth joint. 
The three following joints are small, while the end one is equal to the two preceding 
joints combined (fig. 23). 
Antenne moderately slender, the outer ramus four-jointed and rather longer than 
the penultimate joint of the inner ramus (fig. 24). The mandibles and other mouth 
organs are somewhat similar to those in 7isbe gracilis. 
The thoracic legs are also somewhat similar to those in the species mentioned, but 
in the first pair, the second joint of the inner ramus is proportionally more elongated, 
being fully one and a half times the length of the first joint. The outer ramus scarcely 
reaches to the end of the first joint of the inner one (fig. 26). In the fourth pair, the 
* Crustacea of Norway, vol. v. p. 88 (1905). 
t Resultats du Voyage du s.y. “ Belgica,” “‘ Copepoda,” von Dr W. Giesbrecht, p. 38 (1902). 
{ Deutsche Siidpolar Exped., 1901-1903: “Uber die Copepoden der Stémme Harpacticoida, Cyclopoida,” etc. 
(1910). 
