52 SPOLIA ZEYLANICA. 



notes of the species made by Mr. E. Hindle some years ago, 

 when the spirit had evidently not extracted all the colour. 

 He wrote as follows : — " Each dorsal papilla is hght brown, 

 surrounding this is a band of light gray, and finally there is 

 an outer band of brown spots, marking off the light gray 

 band from the brown background of the dorsal surface. 

 This arrangement of bands of colour varies shghtly, but every 

 papilla on the dorsal surface shades o£E into a hght gray, 

 which is marked by a few brown spots. The ventral surface 

 is hght gray faintly marked by a few small hght brown spots." 

 Ambulacral appendages papillae only, which are to some 

 extent non-retractile. Those on the bivium are somewhat 

 irregularly scattered, but nevertheless show an arrangement 

 into four rows. Along each side of the body are 20 large 

 claw-hke outgrowths, which give the body a characteristic 

 appearance. These processes increase in length towards the 

 middle of the body, where they are 20 mm. in length. On 

 the ventral surface there are two rows of broad papillae, about 

 30 in each row. 



There are 20 dark brown tentacles surrounded by papillae. 



Internal Anatomy. — There is one Polian vesicle on the 

 ventral side and one stone canal on the right side of the 

 dorsal mesentery. As in Holothuria spinifera and the related 

 species, the stone canal is very large. Of the two resj)iratory 

 trees the right is the longer, but the left more bulky. There 

 are no Cuvierian organs. 



Spicules. — Both the specimens examined by me have been 

 preserved for some years, and the spicules show signs of disin- 

 tegration. The spicules are very closely packed and consist of 

 tables and buttons. The tables have usually a very irregular 

 and indefinite shape, probably due to their having been partly 

 dissolved. The most perfect form has a disc lOO [i. in diameter, 

 having a large central hole and about ten peripheral holes, and 

 the tower is surmounted by numerous blunt spines reminding 

 one very mCich of the tables of H. aculeata. The most common 

 type, however, has fewer holes and the edge of the disc is 

 spinous. The tower has four upright and one transverse 

 beam. The buttons are knobbed and are extremely ii-regular 

 in shape. They have an average length of 40 i^. 



