76 8P0LIA ZEYLANIGA. 



the buttons of a typical Holothurian, in which the outer walls 

 bounding the holes of the buttons have been broken down. 

 Nevertheless the perfect button is very rarely found in this 

 species. These buttons differ from those of H. curiosa. 



General Distribution. — The Indo-Pacific region. Not very 

 common. 



Remarks. — The specimens which I have under examination 

 differ in no respect from those described by me in 1910 (34), 

 and which I identified as H. dofleinii, Augustin. On fm'ther 

 examination I beheve that this species is identical with 

 H. fusco-cinerea, Jager, and H. 'pervicax, Selenka. I consider 

 that Augustin's grounds for not including his specimens under 

 H. fusco-cinerea are insufficient. The two reasons for his 

 not doing so are the presence of white rings around the 

 papillae in his specimens and the character of the buttons. 

 With regard to the first of these, I have before me sufficient 

 material to state that the colour of the rings around the 

 papillije varies to a considerable degree. As for the spicules I 

 cannot see any difference of sufficient importance to justify 

 Augustin's new species. 



There is no doubt that Semper's Holothuria fusco-cinerea 

 is identical with H. curiosa, Ludwig, and not with Jiiger's 

 species, although H. fusco-cinerea, Jager, and H. curiosa, 

 Ludwig, are undoubtedly closely related. But I do not agree 

 with Bedford and Theel that H. curiosa should be included 

 in H. fusco-cinerea, Jager, since the colour markings and the 

 buttons are different in the two forms. Ludwig (23) describes 

 his H. depressa as having a grayish-brown colour and three or 

 four transverse brownish marks ; on the trivium the pedicels 

 were numerous, and on the bivium the papillse were sparsely 

 scattered and situated upon wart-like elevations, the tips of 

 which had a dark colour. The pedicels of the trivium were 

 each surrounded by a light ring. 



Selenka's (37) short diagnosis and Fisher's (II) exhaustive 

 description of Holothuria pervicax agree with the account of 

 H. fusco-cinerea which I have given above. 



I cannot agree with Bedford that H.argus is aUied to this form. 

 In external appearance, in the nature of the spicules and cal- 

 careous ring, that species differs greatly from H. fusco-cinerea 



