372 Annals of the South African Museum. 



from near the Nicobar Islands, near the Kei Islands and from the 

 Hawaiian Islands. 



P.F. 12793. East London, N.W. V-. N., 20 miles. 400-450 fms. 

 S., st. 4 specimens; small adults and young. 



CENTRECHINIDAE. 



This distinctly tropical, shallow-water family, is scarcely entitled 

 to a place in this report for it occurs only at Mozambique or as a 

 straggler southward to Natal. The' three species, long known from 



Mozambique, and two of which have been reported from as far south 

 as the Cape of Good Hope, are easily distinguished from each other 

 as follows. 



Key to the Sotith African Species of Centrechinidae. 



Test and spines black or blackish; primary spines sometimes banded, black and 



white. 



Ambulacral primary spines not essentially different from those of inter- 

 ambulacra ; ambulacra with few or no secondary spines abactinally and nar- 

 rower there than at ambitus ; a conspicuous abactinal white spot in life, in 

 each interambulacrum ..... Centrechmus setosus. 

 Ambulacral spines filiform, smooth, except near tip; ambulacra with numerous 

 secondary tubercles abactinally, and distinctly wider there than at ambitus; 

 interambulacral primary spines fragile, diameter of their central cavity more 

 than half diameter of spine ; minute teeth on spine in distinctly separated 

 whorls ...... Echinothrix calamaris. 



Test and and spines with no black ; greenish and red or red-brown, the prevailing 



tints; test very flat ...... Astropyga radiata. 



CENTRECHINUS SETOSUS. 



Echinometra setosa Leske, 1778. Add. ad Klein, p. 36; pi. XXXVII, 



figs. 1, 2. 



Diadema setosa Gray, 1825. Ann. Phil., vol. 26, p. 426. (Auct. omnes). 

 Centrecliinus setosus Jackson, 1912. Phyl. Ech., p. 28. 



This well-known Indo-Pacific sea-urchin is represented in the col- 

 lection at hand, by a single specimen collected along shore at Mo- 

 zambique by K. H. Barnard. The test is about 35 mm. in diameter 

 and the primary spines are 65-70 mms. long. The characteristic 

 white spots in the interambulacra, abactinally, can still be detected, 

 which is unusual in dry specimens. The species has long been known 

 from Mozambique and Mr. Agassiz list's it in the "Revision" from 

 Simon's Bay, Cape of Good Hope. Bell (1904, Mar. Inv. S. Africa, 

 vol. 3, p. 168) lists a young specimen from off Cape Morgan, in 



