NO. 5 CLARK : ECHINI OF WARMER EASTERN PACIFIC 243 



PLATE 37 



Fig. 5. Hesperocidaris asteriscus, new species, aboral view, xYz, P- 232 

 Fig. 6. Hesperocidaris asteriscus, new species, oral view, x% 



PLATE 38 



Fig. 7. Centrocidaris Doederleini (A. Agassiz), aboral view, xl, p. 234 

 Fig. 8. Centrechinus mexicanus (A. Agassiz),* oral view, xj4) p. 235 



*In a recent letter from Th. Mortensen he states that The International Com- 

 mission on Zoological Nomenclature meeting in Paris this summer (1948) rendered 

 an Opinion which codified the name Diadema as a nomen conservandum. 



This species is, therefore, Diadema mexicanum A. Agassiz, order Diadema- 

 toidea, family Diadematidae. These corrections replace corresponding names 

 used on p. 235 of the text. 



