ENTOMOSTHACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 305 



spines, as shown in the drawing (fig. 21) ; the outer ramus is considerably shorter than 

 the inner, and the spiniform seta at the outer angle of the second basal joint is remark- 

 ably stout. The next three pairs have both rami also three-jointed, and are of 

 normal form. 



In the fifth pair, which were somewhat imperfect, the basal joint was bilobed and 

 moderately expanded ; the end joint, which is of a narrow ovate outline, is about three 

 times longer than broad, but, being imperfect, its dimensions could not be accurately 

 made out (see fig. 22). 



The specimen a female represented by the drawing (fig. 16) measured 0'88 mm. 

 in length. It agrees so closely in size and form and in the structure of its various 

 appendages with the description and drawing of Psamathe longicauda given by 

 G. 0. SARS in the work referred to above, that I have no hesitation in ascribing it to 

 the same species. 



The distribution of Psamathe longicauda is apparently extensive, for in addition 

 to the Mediterranean records by PHILIPPI and GLAUS, it also belongs to the Copepod 

 fauna of Britain and Norway. It has also been reported from Franz Josef Land as 

 well as from the Black Sea. Its occurrence at the Scotia Station 27 extends its 

 distribution to the south of the Cape Verde Islands. 



Psamathe fucicola, new species. (PI. VI. figs. 12-19.) 



Female. The female of this species has a general resemblance to Psamathe 

 longicauda, Philippi, but is rather smaller. The length of the specimen represented by 

 the drawings is 075 mm. 



Antennules moderately stout and composed of nine joints ; second joint tolerably 

 large, and fully one and a half times longer than the next ; the fifth, sixth, and seventh 

 very small ; the last two joints are slender, but rather longer than those immediately 

 preceding (fig. 12). 



The antennae, mouth organs, and swimming feet are nearly as in Psamathe 

 longicauda. 



In the fifth pair the second joint is about three times longer than broad ; both the 

 lateral margins are fringed with minute bristles ; a small spiniform seta also springs 

 from near the distal end of the inner margin, and another from the apex of the joint 

 (fig. 18). The caudal rami are short and broad (fig. 19.) 



Habitat. Found on floating seaweed "Gulf-weed" collected between the Cape 

 Verde Islands and the Azores in June 1904 ; Station 538, 32 11' N., 34 10' W. 



Remarks. The Harpactid recorded above has a close resemblance to Psamathe 

 longicauda, Philippi, and may be mistaken for that species. It is, however, rather 

 smaller ; the proportional lengths of the joints of the antennules are somewhat different ; 

 the thoracic legs are rather more slender, and the armature of the fifth pair, especially, 

 differs distinctly from the species referred to. 



(ROY. ROC. KDIN. TRANS., VOL. XLVIII., 551.) 



