72 DISCOVERY REPORTS 



The Belgica collection reported by Hubert Ludwig (1903) added eleven new 

 Antarctic species, of which three are synonymous with Challenger species. 



The new species in the Discovery collection, some from regions already partly ex- 

 plored, indicate that we are yet a long way from having a complete picture of the 

 Antarctic fauna. The following is a list of new forms, the exclusively sub-Antarctic 

 being marked with an asterisk : 



Acodontaster eloitgatus granuliferus forma L. dcnsiis 



ceramoideiis* Payalophaster gode/royi meseres 



Notiocerainiis anomahis OdiiuUa mitrix 



Pergamaster synaptonis Anteliaster australis 



Cladaster analogus* Lethasterias australis* 



Hippasteria Jalklandka* Notaslerias stohphora 



Perknaster sladeni georgiamis Psalidaster mordax* 



Anseropoda aiUarctica Lysasterias hemiora 



Miraslrella biradialis L. heteractis 



RhopieUa koehleri Luidia heterozona (Africa) 

 Lophaster tnarionis* 



Notioceramiis, Mirostrella, Odinella, and Psalidaster are new generic types, based 

 upon new species, while RhopieUa, Paralophaster, and Myor aster are based upon species 

 already known. A new subgenus Apterodon is instituted for a natural section of Pteraster, 

 and Euretaster is a new name for the old genus Retaster, which by one of the accidents of 

 nomenclature was really without a name. Spoladaster is a new generic name for 

 Cryaster brachyactis H. L. Clark, which is not a Cryaster (i.e. Perknaster) but is related 

 to Tylaster (Asteropidae). 



It is still premature to analyse in detail the distribution of Antarctic species. The 

 Discovery collection has materially enlarged, sometimes radically, the previously 

 known range of included species. Some forms now believed to have a limited distribu- 

 tion are undoubtedly wide ranging. Certain characteristics of the Antarctic fauna may 

 be noted. 



There are no families strictly confined to the southern hemisphere, although the 

 Ganeriidae are southern with two possible exceptions,^ and the Odontasteridae are more 

 numerous in genera and species in sub-Antarctic and Antarctic regions. 



The following genera are Antarcticf or sub-Antarctic :* 



ASTROPECTINIDAE GaNERIIDAE 



Mimastrella^* Scotiaster\ 



Odontasteridae Ganena\* 



Asterodon* Cycethra-\* 



Acodoiitaster\* Perknaster^* 



GONIASTERIDAE ASTERINIDAE 



Notioceramus\ Kampylaster\ 



Pergamaster] Mirastrella\ 



Chitonaster\ 



1 Leilaster A. H. Clark, 1938, p. i, pi. i, figs, i, 2. Alciitiasfer A. H. Clark, Proc. U.S. National Museum, 

 vol. Lxxxvi, 1939, p. 497, pi. 57. 



