72 SPOLIA ZEYLANIOA. 



the bivium. There are twenty light yellow tentacles. Around 

 the base of the flattened head of each tentacle there is a row 

 of small black spots. The mouth is surrounded by a ring of 

 small papillae, and there are five small groups of papillae 

 around the anus. 



Internal Anatomy. — The internal organs call for no special 

 mention. The calcareous ring is very small and the inter- 

 rstdial pieces in particular are extremely dehcate. There are 

 one or two PoHan vesicles and a single stone canal. 



Spicules. — These consist of tables and buttons in the general 

 integument. The tables have a base 65 \i in diameter 

 perforated by a large central hole and about ten or a dozen 

 small peripheral holes. The tower is 60 ^ high and has one 

 cross beam, and is surrounded by about eight irregular teeth. 

 The buttons are 65 [j, long and are smooth, and have three 

 pairs of holes. There are irregular rods in the papillae and 

 fenestrated plates in the pedicels. 



General Distribution. — A common form in the shallow waters 

 of the tropical Indo -Pacific region. 



So far as one can gather from Bell's scanty description and 

 from the figures of the spicules given by him, Holothuria 

 madeari would appear to be the same as H. monacaria, as 

 Tlieel has suggested. Bell does not give the colour of his 

 species, but his description of the arrangement of the pedicels 

 and papillse and the presence of white rings around them, 

 together with the appearance of the deposits, would serve 

 equally well as a description of H. monacaria. Further, he 

 shows that the buttons are smooth, so that if reproduced 

 correctly they cannot resemble those of H. scahra (tigris), as 

 he suggests, since the latter species has knobbed buttons. 

 This mistake is probably due to the incorrectness of Selenka's 

 figure of the buttons of H. scahra. 



I have before me a single specimen from the collection of 

 the late Professor Mitsukuri of Tokyo, labelled H. madeari, but 

 I have not the slightest hesitation in assigning this specimen 

 to H. monacaria, both on account of the external appearance 

 and general characters, and also because of the nature of the 

 deposits. 



