213 
is very short, and figures are given of the calcareous bodies alone. 
(Holothurien. p. 92. Taf. XXX, Fig. 21). Excepting the number of 
Polian vesicles (1), there is nothing either in the description or in 
the figures of the deposits which does not agree with the present 
species, and as the type appears to have been lost, (I am informed 
that it is not found in the Wiirzburg collection) it seems reason- 
able to adopt the name Actinopyga difficilis (Semper) for this 
species. _ 
The present studies thus have led to the result that among the 
forms hitherto confused with Actinopyga parvula (Sel.) the follow- 
ing species are to be distinguished. 
1 . Actinopyga parvula (Selenka). 
Miilleria parvula. E. Selenka. Beitrage z. Anat. u. Syst. d. Holothurien. 
Z. wiss. Zool. XVII. 1867. p. 314. Taf. XVII, Fig. 
17—18. 
Holothuria captiva. H. Ludwig. Beitrage z. Kenntniss d. Holothurien. 
Arb. zool. Inst. Wiirzburg. II. 1874. p. 32. 
Miilleria parvula. Hj. Théel. „Challenger“ Holothurioidea. II. 1885. 
p. 220. 
„ C. Ph. Sluiter. Westindische Holothurien. Zool. 
Jahrbiicher Suppl. XI. 1910. p. 333. (In Kiiken- 
thal & Hartmeyer. Ergebnisse einer zool. 
Forschungsreise nach Westindien.) 
Holothuria captiva. W. I. Crozier. Multiplication by fission in Holo- 
thurians II. Amer. Naturalist. 1917. p. 560. 
Distribution. West Indies. (Florida, Jamaica, 
St. Barthélemy, Barbados, Tobago; Bermuda). 
2. Actinopyga flavo=castanea Théel. 
Miilleria flavo-castanea. Hj. Théel. „Challenger“ Holothurioidea. II. 
1885. p. 198. 
Non: Argiodia flavo-castanea (Théel). I. Pearsson. Notes on the Holoth. of 
the Indian Ocean. II. The subgenera Argiodia and 
Actinopyga. Spolia Zeylanica. IX. 1914. p 176. 
3. Actinopyga difficilis (Semper). 
Holothuria difficilis. Semper. Reisen im Archipel d. Philippinen. I. 
Holothurien. 1868. p. 92. Taf. XXX, Fig. 21. 
_ — T h é e 1. „Challenger“ Holothurioidea. II. 1885. p. 219. 
