82 SPOLIA ZEYLANICA. 



general colour is auburn ; and the appendages appear to 

 be more numerous and larger than in typical specimens. 

 Internally they show no points of interest. The deposits differ 

 slightly from typical forms in that the disc of the table is 

 frequently much reduced and the holes of the buttons are 

 extremely small. 



Holothuria maculata burrows in the sand between tide-marks. 



HOLOTHURIA RUGOSA, Ludwig. 



(Plate XII., fig. 19.) 



Holothuria rugosa, Ludwig 1875 (23), 1882 (26) ; Lampert 

 1885 (19); Theel 1886 (42) ; Bedford 1898 (2); 

 Koehler & Vaney 1908 (7). 



? Holothuria triremis, Sluiter 1901 (41). 

 One specimen, obtained by Mr. J. Stanley Gardiner in the 

 Maldives. 



External Characters.-^ — Length 85 mm., breadth 20 mm. 

 The colour in spirit is yellowish-brown. There are papillae 

 on the bivium and true pedicels on the trivium. In the 

 specimen examined by me all the papillae are closely retracted, 

 but the pedicels are still half expanded. The pedicels are 

 arranged in three distinct rows on the trivium. The central 

 row is clearly double, and the lateral rows are single, althoiigh 

 in some parts, probably owing to contraction, the lateral rows 

 are zig-zag and thus appear double. A close inspection with 

 a lens shows that the papillae are arranged in six irregular 

 roAvs on the bivium, but with the naked eye very few papillae 

 can be seen. 



Internal Structure. — The calcareous ring agrees with Ludwig's 

 drawings of the species, and it also resembles that of Mesothuria 

 murrayi, Theel, a resemblance which is also seen in the case 

 of the spicules. But Mesothuria murrayi differs in many 

 respects from the above species, and is undoubtedly not 

 identical with it. The tentacles are absent in the specimen 

 from the Maldives, as are also the jorincipal internal 

 organs. 



