43 Holothurioidea, Asteroidea, and Echinoidea from 

 Juan Fernandez and Easter Island. 



By 



E. DEICHMANN, I. LIEBERKIND, and TH. MORTENSEN. 



With 8 textfigures. 



The collection of Holothurians, Asteroids, and Echinoids, brought home 

 by Mr. K, BackstrOm, has, we regret to say, proved a disappointment. A 

 careful survey of the marine fauna of these two islands could not fail to bring 

 forth facts of very considerable interest, at least from a zoogeographical point 

 of view. As regards the groups here treated, the collection is too incomplete to 

 bring forth these facts. It does not contain all the forms hitherto known to 

 occur at these two islands, and thus does not adequately represent this part 

 of their fauna. Only one new fact of interest has been brought to light by 

 this collection, viz. the occurrence at Easter Island of Actinopyga difjicilis. 

 On account of this deficiency the collection has not been thought fi fit basis 

 for zoogeographical discussions. 



I. Holothurioidea 



by 

 . , . B:. DEICHMANN. - r ' ' ' ^ .: 



The collection of Holothurians is very small, containing in all only three 

 ispecies, viz. two from Juan Fernandez and one from Easter Island. , 



These species are: ' ; ... 



Juan Fernandez: Holothuria Platei Ludwig. . ' 



,, • .. Chiridota fernaftdensis Ludwig 



Easter Island: Actinopyga difficilis (Semper). 



I. Holothuria Platei Ludwig. — H. Ludwig 1898. Die Holothurien 

 d. Sammlung Plate. Zool. Jahrbiicher; Suppl. IV, p. 432 — 43, Taf. 26. Fig. 

 I— 14. . ^ 



