30 
R. NORRIS WOLFENDEX. 
CLAUSOCALANUS (Giesbrecht). 
Clausocalanus arcuicornis. 
Clausocalanus arcuicornis. Giesbrecht, Atti. Acc. Lincei Rend., Ser. 4., vol. 4, p. 834. 
„ „ Giesbrecht, Fauna u. FI. Neap. XIX. (1892), p. 50. 
„ „ Giesbrecht u. Schmeil, Das Tierreich, p. 27. 
That this species should occur so far south is rather peculiar. It was found in the 
collections made at:— 
Lat. 49° 40' S. 
Lat. 55° 44' S. 
Lat. 56° 12' 45" S. 
Lat. 57° 251' S. 
Lat. 58° 49' 45" S. 
Lat. 59° 19' S. 
Lat. 63° 5' S. 
Lat. 84° 01' S. 
and does not differ essentially from the 
considerably greater range than was thou: 
to nearly the Antarctic Circle. 
Long. 172° 18' 30" W. 
Long. 95° 43' 30" W. 
Long. 136° 18' 30" W. 
Long. 151° 43' E. 
Long. 154° 48' W. 
Long. 120° 24' 30" E. 
Long. 175° 43' E. 
Long. 170° 49' E. 
species common in the Atlantic. It has a 
;ht, since I can record it from the Irish coast 
GAETANUS (Giesbrecht). 
Gaetanus antarcticus. 
(Plate III., fig. 6.) 
Gaetanus antarcticus, Wolfenden, Plankton Studies, Part I. (1905), p. 7. 
Size 8 mm. The body is very robust and dorsally very gibbous. The head and 
first thoracic segment are coalesced, and together much longer than all the rest. The 
last thoracic segment carries two short stout curved spines, directed backwards. The 
head is in its upper part quite square, and with short stout curved spine, directed a 
little forwards. The abdomen is not a quarter the length of the cephalothorax. 
Anterior antennae not as long as the body, of twenty-three segments, with the 
eighteenth, nineteenth and twenty-first segments longer than the twentieth, and all 
joints with very few setae. Ri of the posterior antennae more than half the length of 
Re. Posterior foot jaws with lamellar process on the first basal. 
Maxillae ; Li 2 and Li 3, each with four bristles ; B 2 with five, Ri small and two- 
jointed. Re small, and less than half the length of B 2. 
First feet, Re of three segments with three marginal spines, the segmentation being 
complete ; Ri of only one segment. 
