382 Annals of the South African Museum. 



echini. Until further evidence is forthcoming therefore I must con- 

 sider the young echinoid taken by the VALDIVIA and recorded as 

 reevesii, as a young toreumaticus, a species whose occurrence at Dela- 

 goa Bay no longer admits of doubt. 



The four temnopleurids, whose occurrence, in the region covered 

 by this report, is indisputable, may be distinguished from each 

 other as follows: 



Key to tJie South African Species of Temnopleuridae. 



Size large, diameter 20 mm. or more; color not white; test more or less deeply 

 sculptured. 



Spines more or less bright red .... Salmacis bicolor. 



Spines not at all red or reddish . . Temnopleurus toreumaticus. 



Size small, diameter usually much less than 20 mm.; color more or less white; 

 test only superficially sculptured. 



Peristome with few plates proximal to buccal circle . Orechinus monolini. 



Peristome with membrane proximal to buccal circle, well-plated 



Lamprechinus nitidus. 



SALMACIS BICOLOR. 



L. Agassiz, 1841. Pref. Val. Anat. Ech., p. VIII. A. Agassiz, 1873, 

 Rev. Ech., pi. VHIff, figs. 11, 12. 



This is a well-known sea-urchin of the western Indian Ocean 

 and has long been known from Mozambique. A very good specimen 

 in the South African Museum collection is labelled: "Durban. Jan. 

 1913. Low tide. K. H. Barnard." This is a notable extension of 

 the known range of the species, which is one of the most beauti- 

 fully coloured of sea-urchins. The bright red secondary spines form 

 a good back-ground for the primaries banded with purple and green. 

 The Durban specimen is somewhat subdued in colour as the secon- 

 daries are brown-red and 'the test a dull light green, while most of 

 the primaries are broken. 



In the Revision (Pt. 1, p. 156), Salmacis sulcata (= S. sphaeioi- 

 des L.) is listed from Mozambique but it is probable that there is a 

 mistake somewhere for the species is not otherwise known from the 

 western part of the Indian Ocean. 



TEMNOPLEURUS TOREUMATICUS. 



Cidaris toreumatica Leske, 1778. Add. ad Klein, p. 155. 

 Temnopleurus toreumaticus L. Agassiz, 1841. Int. Mon. Scut., p. 7. 



The occurrence of this characteristically Asiastic species at Delagoa 

 Bay seemed to me so highly improbable that I have never credited 



