HOLOTHTJBIOIDEA OF THE INDIAN OCEAN. 181 



AcTiNOPYGA MiLiARis (Quov & Gaimard). 

 (PI. XXIX., fig. 6.) 



Holothuria miliaris, Quoy & Gaimard 1833. 



Holothuria lineolata, Quoy & Gaimard 1833 (21). 



Mulleria miliaris, Brandt 1835 (4) ; Selenka 1867 (22) 

 Ludwig 1882 (14), 1887 (15), 1888 (16), 1899 (17) 

 Lampert 1885 (10) ; Theel 1886 (26) ; Bell 1887 (3) 

 Sluiter 1901 (25) ; Koehler & Vaney 1908 (9) 

 Pearson 1910 (19). 



Mulleria lineolata, Brandt 1835 (4). 

 Mulleria plebeja, Selenka 1867 (22). 



External Characters. — ^This species attains a size of about 

 200 mm. It is generally coloured a uniform dark brown. 

 Rarely is the ventral surface lighter than the dorsal. There 

 are twenty tentacles. 



Internal Structure. — Internally there appears to be no 

 difference from the arrangement seen in Actinopyga lecanora. 

 In one specimen examined there were two well-developed 

 Pohan vesicles and one stone canal. The calcareous ring is 

 of the usual type seen in this genus. 



Spicules. — These consist of numerous minute " rosettes, " 

 which are dichotomously branched, and which are about 32 \^ 

 in length. 



Remarks. — Selenka examined Quoy & Gaimard's origmal 

 specimens in Paris, and we have to accept his assurance that 

 Holothuria miliaris, Q. & G., Holothuria lineolata, Q. & G., and 

 Mulleria plebeja, Selenka, are all identical. It is fortunate 

 that Quoy & Gaimard's specimens were preserved, since 

 the original descriptions were insufficient for the purposes of 

 identification. This to some degree may be said to apply to 

 Selenka's description of Millleria plebeja. Why Selenka and 

 subsequent writers did not retain the name lineolata is not 

 quite clear, since it appears before miliaris in the original 

 description and therefore takes precedence. The name 



2 B 6(10)13 



