HOLOTHURIOIDEA OV THE INDIAN OCEAN. Oi 



HoLOTHURiA GRAFFEi, Semper. 



(Plate VIII., fig. 7.) 

 Holothuria grajfei, Semper 1868 (38) ; Ludwig 1882 (26) ; 

 Lampert 1885 (19) ; Theel 1886 (42) ; Koehler 1896 

 (16) ; Sluiter 1901 (41). 



Two specimens from Amboina (Geneva Museum), 180 mm. x 

 40 mm., 200 mm. X 45 mm. One specimen from Maldives 

 (Gardiner), 140 mm. X 50 mm. 



External Characters. — The ground colour is brown with 

 numerous small dark spots scattered over the body. There 

 are also some irregular dark brown patches on the bivium, 

 chiefly around the papillae. The ambulacral appendages 

 consist of papillae on the bivium and larger pedicels on the 

 trivium. The pedicels are very large and are arranged in 

 three well-defined rows, the middle row being broader than 

 the two lateral ones and being about five or six pedicels thick 

 in the middle of the body, but narrowing towards each end. 

 The lateral rows are three pedicels thick at the middle of body 

 and two towards each end. Near the anus the pedicels seem 

 to give place to small papillae which terminate near the edge 

 of the anus. Anteriorly the pedicels stop at a distance of 20 

 mm. from the mouth. Near the anus the papillae of the back 

 appear to form two distinct rows, but very soon each row 

 subdivides into three, so that along the greater part of the 

 bivium there are about six irregular rows of papillae. The 

 mouth is surrounded by a rim of papillae. There are 25 

 tentacles. 



Internal Structure. — The calcareous ring is very large and is 

 similar to that of H. argus and the related species. In the 

 specimen dissected by me there were two Polian vesicles and 

 a dozen stone canals, six on each side of the dorsal mesenteiy. 

 The species appear to show considerable variation in regard 

 to the number of stone canals and Polian vesicles. Cuvierian 

 organs are present. 



Spicules. — These consist of two kinds of bodies. First, 

 there are numerous irregular fenestrated plates, and there are 

 also irregular bodies which have been compared by previous 



