152 COLLECTIONS PKOM MBLASTESIA. 



16. Holothuria lineata. 



Ludrnng, Semper's Arbeiten, ii. p. 103. 

 One specimen from Thursday Island ; skin very thick. 



17. Holothnria peregrina. 



Ludung, Semper's Ai-beiten, ii. p. 105. 



With considerable doubt I refer to this species a single specimen 

 from Thursday Island. 



18. Holothnria modesta (?). 

 Holothuria modesta, Semper's Arbeiten, ii. p. 106. 



Professor Lud-wig described his species from a single specimen, 

 and, curiously enough, there is only one specimen in the ' Alert ' 

 collection. The characters of the supporting rods in the suckers 

 leads me to believe that the two are forms of the same species ; but 

 a full examination is not possible with a single representative. 



Torres Straits. 



19. Holothuria macleari. (Plate IX. fig. G.) 



As will be seen by the figures, the spicules of this species present 

 a considerable resemblance to those of H. tigris, with which, as it 

 would seem, it must be -closely allied. 



As there is but a single specimen, presenting well-marked external 

 characters, I think it right to limit myself to an account of these. 

 Body-elongated, trivium fiat, bivium convex, anus round, unarmed, 

 without (perhaps having lost) any distinct indications of pentame- 

 rous marking ; ambulacra! pa<piU% on the convex back, three rows 

 of not very regularly arranged suckers on the trivium. An appear- 

 ance of ringing both above and below is produced by the white 

 colours and transverse setting of the papillae and suckers respec- 

 tively ; as the former are less numerous than the latter, there are 

 only about thirty bivial rings, while on the trivium two or three 

 rings are here and there confluent and present a kind of longitudinal 

 marking. 



The single specimen is 49 miUim. long and 10 mUlim. wide. 



" Clairmont and Bird Islands," N.E. Australia. 



A specimen from the island of Rodriguez, in the possession of the 

 British Museum, apparently belongs to this species. 



