The Ecliinoderm Fauna of South Africa. 415 



* THYONE SERRATA. 



Britten, 1910. Schultze's Zool. Anthrop. Erg. Forsch. Siidafrika, 



vol. 4, pt. 1, p. '242. 



This species is closely related to the European T. fusus but seems 

 to be recognizably different. It is known only from Angra Pequena 

 Bay where it seems to be fairly common. 



THYONE SACELLUS. 



Stolus sacellus Selenka, 1867. Zeit. f. wiss. Zool., vol. XVII, p. 355; 



pi. XX, figs. 115, 116. 

 Tlujone sacella Theel, 1886. CHALLENGER Holos., p. 138. 



This species, well characterized by its calcareous ring and particles, 

 has long been known from Zanzibar and Mozambique. The presence 

 in the South African collection of specimens from Delagoa Bay, 

 marks a note-worthy extension of the range southward. These 

 specimens are 42 70 mm. long and are white or very pale reddish 

 in color. They are accompanied by the following notes: 



Delagoa Bay: Inyack Island. Oct. 1912. K. H. Barnard. Dull 

 claret. In rock crevices. 1 specimen ; adult. 



Delagoa Bay: Inyack Island. Oct. 1912. K. H. Barnard. Claret 

 colour. Beneath corals. 2 specimens; adult and young (half grown). 



THYONE AUREA. 



Holothuria aurea Quoy and Gaimard, 1834. ASTROLABE Zool., vol. IV, 



p. 120; pi. 7, figs. 1517. 

 Tlujone aurea Semper, 1868. Holothurien, II heft, p. 66. 



The presence of some twenty Thy ones, in more or less poor con- 

 dition, from Table Bay, indicates that the species is common at the 

 Cape. Most of the specimens were found washed up on the beach, 

 some at least among the "holdfasts" of Laminaria. The colour of 

 these specimens is said to have been "pink". While one cannot 

 determine positively from Quoy and Gaimard's account, whether this 

 Tlujone is their Holothuria aurea or not, I feel so sure that it is, I 

 am unwilling to give it a new name. The calcareous ring is like 

 that of T. sacellus but the calcareous particles in the skin are entirely 

 different and are very distinctive. They are small flat rods perforated 

 at one or both ends, and irregular plates, of which these rods are 

 the apparent starting point; thus there may be a hole on either or 



