HOLOTHURIOIDEA OF THE INDIAN OCEAN. 81 



respiratory trees are well developed, that on the right side 

 being longer than the left, but not so large, 



Sjncules. — In the general integument there are tables and 

 smooth buttons. The tables have a disc 60 [t- in diameter, 

 which has four large central holes and a varying number of 

 peripheral holes. The tower is of the ordinary type and is 

 surrounded by numerous spines, and is 42 [i high. The 

 buttons have three pairs of holes and are 50 [>. long. They 

 are extremely thick. The supporting rods of the pedicels are 

 curved rods 100 [x in length, and have perforated enlargements 

 at each end and in the middle. 



Distribution. — Tropical waters of the Indo-Pacific region. 



Remarks. — Fisher (11) has pointed out that the name 

 maculata, which is generally given to this species, must give 

 place to arenicola, since the former name was given to a species 

 of the same genus by Chamisso & Eysenhardt in 1821. But 

 this species, which was first named ^oZo^Awna maculata in 1821, 

 and later on Fistularia maculata in 1834, is now known as 

 Synapta maculata. The species under discussion, on the 

 other hand, was first described in 1835 under the name 

 Sporadijius maculatus, a designation which is not invalidated 

 by any of the synonyms of Synapta maculata. Holothuria 

 maculata was first given its present name by Ludwig (25) in 

 1881, when the Synaptid was no longer placed in the genus 

 Holothuria. 



Nevertheless a species described by Lesseur in 1824 had 

 alread}' been named H. maculata, a name which strictly should 

 still stand. Since, however, Lesseur's description is too 

 imperfect for purposes of identification, and since, moreover, 

 the name maculata has been given to the species under 

 discussion by most authors of recent years, the name has 

 become established, and I do not propose to use Semper's 

 synonym arenicola in place of the now almost universally 

 accepted name maculata. 



Five specimens of this species collected by Mi\ Cyril Cross- 

 land at Suez, differ somewhat from the recognized form. The 

 two rows of dark patches are absent from the bivium, but at 

 each extremity there is a well-defined area in which the ground 

 colour is black and the appendages are light yellow. The 



M 6(5)13 



