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expected result that this is a separate species, quite distinet from 
any of those mentioned above, as also from any other species 
hitherto known. Even the size forms a very conspicuous character, 
the animal being apparently fullgrown at a length of 2,5 cm. 
I shall now give a description of this species naming it Actino- 
pyga Bedfordi. Length 2,5 cm. Colour brown. Integument weak. 
The animal is nearly transparent. Pedicels ventral, long and few, 
in three rows, the median double. Papillæ in the dorsal side few 
and small, hardly perceivable. Tentacles 15—16. Anal opening 
surrounded by 5 small, plateformed teeth. 
Calcareous ring of ordinary type, very soon destroyed by hypo- 
chlorite of sodium. Short tentacle ampullae. 2 Polian vesicles, 1 
dorsally embedded madreporic canal. Muscular bands siender. Rete 
mirabile present. Respiratory tree short, in length exceeding the 
very short Cuvierian organs and the right and left branches are 
of equal length. 
Deposits in the skin are absent, in most of the specimens only 
some small, ellipsoid grains are present. In one specimen deposits, 
in all respects exaetly like those figured by Bedford, were present. 
While thus the „ Actinopyga parvula“ of Bedford has no- 
thing with that species to do, — nor with the false Pacific A. par- 
vula, as is evident from the facts here given, the species named 
Holothuria difficilis Semper by Bedford appears to be identical 
with the Hawaiian species. Bedford gives only a figure of the 
animal; about the calcareous bodies he says: they agree with 
Semper’s short description and figures". Unfortunately nearly all 
the spicules in the specimens at my disposal have been quite 
dissolved, — perhaps on account of acidity of the aleohol in which 
they were preserved (it does not appear from Bedford’s paper 
that they were preserved in formalin) — but the pieces left seem 
to be identical with those in the Hawaiian form. Also the other 
characters are perfectly identical with those of the Hawaiian form. 
Both specimens possessed well developed anal teeth which could 
be seen without hånd lens, and one of the specimens was regen- 
erating the forepart, which only had 15 tentacles, — so I have 
no doubt that they are really identical. 
The description, given by Semper of his Holothuria difficilis, 
