240 SoiitJiern Cross. 



tlie genera defined by Professor G. 0. Sars in his " Crustacea 

 of Norway " (29). The species described below is obviously a close 

 relation of Mr. Beddard's P. dimorphus, and, considering the present 

 state of our knowledge, I have preferred to place this 'Southern 

 Cross ' species with his rather than constitute a new genus, merely 

 notifying the fact that Professor Sars' (29) and Mr. Beddard's (2) 

 senus Paratanais are not in accord. But for the structure of the 

 uropods I should have placed this and Mr. Beddard's species in Sars' 

 genus Heterotanais. 



Paeatanais antakctica. 

 (PI. XXXI.) 



Cephalon very large, pyriform, eyes distinct at the base of the 

 antennae. Thoracic segments very slightly tapering, the first one is 

 the broadest, and less rounded laterally than the others. The fourth 

 and fifth are sub-equal in length. The abdomen continues uniformly 

 the slight taper of the thorax, and the first segment is longer than the 

 following five, but the last is longest as well as narrowest, and is 

 ovoid in shape, with a terminal setose projection in the middle line. 

 The uropods are conspicuous, and comprise a short and stout peduncle, 

 with two-jointed exo- and endopodites, the former being the largest. 



First antenna. Peduncle two-jointed, the first joint being two 

 and a half times as long as the second. The fiagellum is three- 

 jointed ; the first joint is very small, with two setae ; the second also 

 carries two setae distally, and is twice as long as the rounded terminal 

 joint, which carries four long setae. 



In the female it is triarticulate. 



Second antenna. Peduncle three-jointed. The joints are stout, 

 and not very large ; the first is shortest and the second longest, the 

 third carries a slender spine distally. The fiagellum is three-jointed. 

 The first joint is about as long as the peduncle, but much more 

 slender, and somewhat curved. The second joint is about half the 

 length, and both bear distally one or two setae. The terminal joint, 

 which carries four setae, is minute. 



Mandible. Cutting edge incurved, with fine serrations on the 

 frontal margin. Molar tubercle well developed. 



Maxillipede five-jointed. The dactylus small, digitiform, with 

 four long setae, propodos longer and much stouter, inner margin 

 expanded about the middle of the joint, bearing four long setae. 

 Carpus with three long setae near the inner distal extremity, and 

 the meros expanded externally round the carpus. 



