KEY TO SPECIES 131 



Antarctic and the Magellan region of South America. So far as three classes of echino- 

 derms — asteroids, ophiuroids and echinoids — are concerned the fauna of the Kerguelen 

 group is much more nearly related to the fauna of the Magellan region than to that of 

 the Antarctic (Mortensen, 1910, p. 100; Koehler, 1912, pp. 221-7). But Regan (1914, 

 p. 36), having studied the fish faunas of the three regions, describes the Kerguelen 

 group as an Antarctic district; and Norman in two papers on more recent collections of 

 fishes confirms his views (1937, 1938). He says (1938, p. 100): "it is clear that, although 

 the coastal fish fauna of the Kerguelen district shows certain features of resemblance to 

 that of the Patagonian region and the Antipodes, its affinities are mainly with that of 



Antarctica." 



Since no crinoid is known to occur both in the Kerguelen and Magellan districts, 

 whereas two {Promachocrinus kerguelensis and Solanometra antarctica) are known both 

 from Kerguelen and Heard Islands and the Antarctic, I have treated those islands, with 

 the above reservations, as outliers of the Antarctic. 



No other species of Notocriniis than virilis and mortenseiii are known. 



ACKNOWLEDGEMENTS 



It is a great pleasure to acknowledge in the first place the constant and generous help 

 I have received from Mr A. H. Clark. When he knew that I was finding many viviparous 

 species he re-examined his co-types of Emnorphometra conciniia, found that it too was 

 viviparous, and sent me brood-pouches so that I might describe them. He has kindly 

 compared my single specimen of E. aurora with E. concinna and has found that they 

 are not, as I thought they might be, identical. He examined for me a specimen of 

 Kempomeira grisea, suggested the diagnosis of the genus which I have used, and helped 

 me to decide upon the position of the genus. 



Dr Mortensen has helped me by comparing a specimen of my hometra graminea with 

 one of his specimens of /. vivipara, taken by the Swedish Antarctic Expedition, from the 

 Graham Land region; and Professor Sixten Bock of Stockholm kindly sent me, for 

 examination and comparison, all the remaining specimens of /. vivipara taken by the 

 Swedish Expedition. I take this opportunity of thanking them both. 



The drawings for the text-figures were made by Miss E. C. Humphreys. 



KEY TO THE COMATULIDS KNOWN TO OCCUR IN 

 DEPTHS OF o-iooo METRES IN ANTARCTIC SEAS 



A Oral pinnules long and whip-like; P^ of 30-60 or more segments; P, usually as long; 

 large species. 

 B 6-1 1 rays and 12-23 arms— usually 10 rays and 20 arms Promachocrinus kerguelensis. 



BB 5 rays and 10 arms. 



C Ossicles of the division series and the brachials with a conspicuous and usually 

 high narrow median keel; cirri of large specimens of 60-80 segments; P, much 

 shorter than Pi Antiiometra adriani. 



