GEOGRAPHICAL DISTRIBUTION 267 



St. 33 of Nordenstam's paper is given as South Georgia, and at this station the three 

 species S. paradoxa, S. schythei and S. convexa were collected : this is the only reference 

 to the presence of these species within the Antarctic Convergence either in Nordenstam's 

 or any other paper. Their distribution is outside the convergence, off the coasts of the 

 southern part of South America and on the shores of the Falkland Islands as well as in 

 the comparatively shallow waters between the two. 



The locality of St. 34 b is given as "Atlantic Ocean, North of Falkland Islands and 

 East of Patagonia, lat. 44° 19' S., long. 57° 34' W." and at this station S. polita and 

 S. septemcarinata were collected ; two species which occur otherwise either zvithin the 

 convergence or, in the case of S. septemcarinata, around the shores of Kerguelen Island 

 as well. 



It is possible that the labels referring to the material collected at these two stations 

 have been interchanged, since the three species collected at St. 33 are characteristic of 

 the locality represented by St. 34 b, and the two species collected at the latter station 

 are characteristic of the locality represented by St. 33. This view is supported by the 

 fact that at neither station were species characteristic of that locality collected, and, 

 further, by the facts that both these areas have been extensively explored and that, in 

 the numerous records, the distribution of the species has been so remarkably consistent. 



CLASSIFICATION 



ISOPODA, Latreille 



FLABELLIFERA, Sars 



Family SEROLIDAE 



The family Serolidae, together with the families Anthuridae, Cymothoidae and 

 Sphaeromidae, is included in the sub-order Flabellifera, Sars ; it is perhaps more closely 

 allied to the Sphaeromidae than to either of the other families. There are, however, 

 fundamental differences between the members of the two families, for in the Serolidae 

 the first and second thoracic somites are fused with the head, and the tergum of the 

 eighth thoracic somite is usually absent and when present is never complete. In the 

 Sphaeromidae only the first thoracic somite is fused with the head, and the remaining 

 seven somites are all free and complete. 



The family Serolidae contains the single genus Serolis, Leach, consequently the 

 following definition will serve equally well for the family. 



Genus Serolis, Leach 



Onisais, Fabricius, 1787, p. 240. 

 Aselliis, Olivier, p. 252. 

 Cymothoa, Fabricius, 1793, p. 503. 

 Serolis, Leach, 1825, p. 340. 

 Brongiartia, Eights, 1833, p. 53. 



