HOLOTHURIOIDEA OF THE INDIAN OCEAN. 89 



is well arched and the trivium is flattened. There are five 

 groups of papillse around the anus. There are twenty light 

 yellow tentacles. The tentacles are surrounded by a rim of 

 small papillae. 



Internal Structure. — The calcareous ring presents no features 

 of importance. There is a single Polian vesicle 25 mm. long 

 when contracted. The single stone canal is situated on the 

 right side of the dorsal mesentery. As Theel has pointed out, 

 it is of extraordinary length, being 35 mm. long in the 

 specimen of which the measurements are given above. The 

 right respiratory tree is larger than the left. In the specimens 

 examined by me there are no Cuvierian organs. 



Deposits. — These agree generally with Theel's description. 

 They consist of tables and knobbed buttons in the general 

 integument. The disc of the table is rounded and has a 

 diameter of 90 [/., and is perforated irregularly by a number 

 of small holes. Sometimes there is a central hole surrounded 

 by a number of peripheral holes. The under surface of the 

 disc is not always smooth, but is sometimes complicated by 

 the presence of irregular cross-connections. The tower is 

 60 ^ in height, and has one cross-piece, and is surmounted by 

 a large number of spines. 



The buttons are 40 t^ long and have three pairs of holes," 

 and often show irregularities. 



In the papillae there are tables with very high towers 

 (300 [J. high) ending in a single blunt spine, and also irregular 

 perforated plates. The high towers make the identification of 

 this species clear. 



General Distribution. — Philippines, Ceylon. 



HOLOTHURIA OCELLATA, Jager. 



(Plate XIV., fig. 24.) 



Holothuria ocellata, Jager 1833 (14) ; Lampert 1885 (19) ; 

 Theel 1886 (42) ; Koehler & Vaney 1908 (17) ; 

 Pearson 1910 (35). 

 One specimen from the Indian Museum, length 120 mm., 

 breadth 55 mm. 



N 6(5)13 



