43. Holothurioidea, Asteroidea, and Echinoidea from 
Juan Fernandez and Easter Island. 
By 
E. DEICHMANN, I. LIEBERKIND, anp 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 dces 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 Act:mopyga difficilis. 
On account of this deficiency the collection has not been thought a fit basis 
for zoogeographical discussions. 
I. Holothurioidea 
by 
E. DEICHMANN. 
The collection of Holothurians is very small, containing in all only three 
species, viz. two from Juan Fernandez and one from Easter Island. 
These species are: 
Juan Fernandez: Holothuria Platez Ludwig. 
Chiridota fernandensis Ludwig. 
Easter Island: Actinopyga difficilis (Semper). 
1. Holothuria Platei Ludwig. — H. LupwicG 1898. Die Holothurien 
d. Sammlung Plate. Zool. Jahrbiicher; Suppl. IV, p. 432—43, Taf. 26. Fig. 
I—I4. 
