54 SPOLIA ZEYLANICA. 



Spicules. — These consist of tables and buttons. The tables 

 are somewhat irregular, the disc has a diameter of 66 jx, and 

 the edge of the disc is uneven, and sometimes spiny. The 

 disc is perforated by a varying number of holes up to twenty - 

 four. There is no large central hole. The tower is very 

 short and irregular, and in many instances there appears to 

 be only an irregular spiny mass on the disc in place of a tower. 

 Sometimes a short tower can be seen surmounted by a number 

 of spines. The buttons are knobbed and irregular and have 

 a length of about 45 ^. The typical number of holes is six, 

 but there is great variation in this respect, as also in the 

 irregularities of the surface. The papillae are supported by 

 tables and buttons similar to those in the general integument, 

 and in addition there are perforated "cups" 20 ^ in length, 

 and elongated rods 75 [j, in length, with perforations at the 

 centre and the extremities. The papillae have rudimentary 

 terminal plates. 



Eemarks. — This species is evidently alHed to Holothuria 

 aculeata, Semper, both as regards its external appearance to 

 some extent and also its internal structure. The tables, how- 

 ever, differ from those described by Semper. Semper describes 

 his species as being uniformly yellowish-white on the trivium 

 and darker on the bivium, the latter being irregularly 

 streaked with dark brown ; and this description agrees very 

 closely with the colour of the specimen under examination. 



Holothuria marmoeata (Jager). 

 (Plate VII., fig. 4.) 



Bohadschia inartnorata, Jager 1833 (14).* 



Sporadipus (Colpochirota) ualenensis, Brandt 1835 (8). 



Holothuria ualensis, Selenka 1867 (37) ; Semper 1868 (38). 



Holothuria hrandtii, Selenka 1867 (37). 



Holothuria marmorata, Semper 1868 (38) ; Ludwig 1881 (25), 

 1882 (26), 1888 (30) ; Lampert 1885 (19) ; Theel 1886 

 (42); Slinter 1887 (39), 1901 (41); Bell 1887 (5); 

 Pearson 1903 (33), 1910 (34). 



• The numbers in brackets refer to the literature at the end of the 

 Paper. 



