170 



This species was obtained as follows : — 



The spines of this species appear to be pretty constantly 

 either red or purple ; the difference is so marked and seems to 

 be so equall}' divided ainono- the specimens that it appears to 

 me that it would be worth while to make observations on fresh 

 specimens to see if it is due to differences of sex. I do not 

 thini< llii-, ditTercr cp can 1)'.- regarded as specihc, notwithstandinp'- 

 Dr. Mortensen's staten:ent that colour is an " excellent gruide " 

 for dislinouislnng the sj^ecies of Eclnnus.'' 



Echinus gilchristi. 



A number of specimens were obtained of an Ecliinus whidi 

 a])pear to be unclescribed. 



Test tending" to be conical, with rather small apical area ; 

 above the ambitus there is, ordinarily, but not always, a large 

 primary tubercle on each alternate interambulacral plate ; simi- 

 larly below the ambitus there is one on each plate ; the secon- 

 daries are of moderate size, and are rather closely packed. On 

 the ambulacral plates above the ambitus there is more irregu- 

 larity in the disposition of the primaries, but below it there is 

 nearly always one on each plate; these and the secondaries are 

 somewhat smaller in size than on the interambulacrals. The 

 primar)' spines are white, moderately long, giving the uninjured 

 creatures the general appearance of the northern E. ac.it tiis ; 

 the secondary -spines are also white. The denuded test is of a 

 stone-grey colour ; young tests are flattened rather than conical. 



This species may be named after its discoverer, the Govern- 

 ivient Biologi.st at tiie Cape. 



* Danish Ingolf Exped. Echinoidea (1903) p. : 



V' 



