Crustacea. 229 



noteworthy that no Decapods were found within the Antarctic circle 

 or anywhere near it, and further tliat no new genera were discovered ; 

 most of the species belong to well-known genera, and on the whole 

 show a close relationship to northern forms. 



I am also indebted to the Eev. T. Stebbing, F.E.S., for assistance 

 with regard to the Isopoda, and more particularly to Mrs. L. E. Sexton 

 for the drawings, which have been made with extreme care under 

 very disadvantageous conditions. 



CRUSTACEA THORACOSTRACA. 



1. DECAPOD A. 

 Family PORTUNIDAE. 



Nectocarcinus antarcticus. 



Portunus antarcticus, Jacquinot and Lucas, Voyage au Pole Sud (Hombron 

 and Jacquinot), vol. iii. (1853), Crustacea, p. 51. 



Nectocarcinus antarcticus, A. Milne Edwards (21, p. 407.) 



This species was one of the discoveries of Dumont d'Urville on 

 his celebrated voyage to southerji regions. It was also obtained by 

 Eoss (16). The large genus Portumis was broken up into numerous 

 genera by Milne Edwards in 1861 (21), and that author ascribes as 

 the distinctive features of the genus Ncctocardnus the presence of 

 only four anterolateral teeth on the carapace, and the sub-lanceolate 

 character of the dactylus of the last pair of thoracic appendages. 

 In the paper cited above, Milne Edwards assigns three species to 

 this genus, and figures two of them, but not this species. Milne 

 Edwards does not refer to the dactylus of the last thoracic appendage 

 of this species, which is broadly ovate and typically "portunid," 

 and is so figured by Mr. Miers in the ' Zoology of the " Erebus " and 

 " Terror," ' and shown by the specimen in the National collection. 



The ' Southern Cross ' specimens are two in number, an adult male 

 and a young one, and were taken at the Auckland Islands in ten 

 fathoms. 



Distrihution. — Known only from New Zealand and Auckland 

 Islands. 



