12 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 80 : abt. 5 



Pl^TB 3 



FiGT-TBB 1. Zenocentrotus kellersi, a medium-sized specimen, Niuafoou, October 

 6, 1930 (U.S.N.M. No. B. 2970), apical view, natural size. 

 2. Zenocentrotus kellersi, the same specimen, oral view, natural size. 



Plate 4 



FiQTTBE 1. Zenocentrotus kellersi, the largest specimen, Niuafoou, October 6, 

 1930 (U.S.N.M. No. E. 2811), oral view, natural size. Apical view 

 of the same specimen shown in Plate 5, Figure 1. 

 2. Eeterocentrotus trigonarius, Niuafoou, October 6, 1930 (U.S.N.M. 

 No. E. 2918), oral view, natural size. Apical view of the same 

 specimen shown in Plate 8, Figure 2. 



Plate 5 



FioirBE 1. Zenocentrotus kellersi, the largest specimen, Niuafoou, October 6, 

 1930 (U.S.N.M. No. E. 2811), apical view, natural size. Oral view 

 of the same specimen shown in Plate 4, Figure 1. 



2. Zenocentrotus paradoxus, Niuafoou, September 20, 1930 (U.S.N.M. 



No. E. 2814), apical view, natural size. Oral view of the same 

 specimen shown in Plate 7, Figure 2. 



3. Echinometra ohlonga, young, Niuafoou, September 13, 1930 (U.S.N.M, 



No. E. 2897), apical view, X2. Oral view of the same specimen 

 shown in Plate 7, Figure 3. 



Plate 6 



FiGUBE 1. Zenocentrotus paradoxus, the type specimen, Niuafoou, September 20, 

 1930 (U.S.N.M. No. E. 2813), apical view, X2. Oral view of the 

 same specimen shown in Plate 7, Figure 1. 



2. Zenocentrotus paradoxus, Niuafoou, September 20, 1930 (U.S.N.M. 



No. E. 2814), apical view, natural size. 



3. Zenocentrotus kellersi, the smallest specimen, Niuafoou, October 6, 



1930 (U.S.N.M. No. E. 2970), apical view, X2. 



Plate 7 



FiGTJEE 1 Zenocentrotus paradoxus, the type specimen, Niuafoou, September 20, 

 1930 (U.S.N.M. No. E. 2813), oral view, X2. Apical view of the 

 same specimen shown in Plate 6, Figure 1. 



2. Zenocentrotus paradoxus, Niuafoou, September 30, 1930 (U.S.N.M. 



No. E. 2814), oral view, natural size. Apical view of the same 

 specimen shown in Plate 5, Figure 2. 



3. Echinometra oblonga, Niuafoou, September 13, 1930 (U.S.N.M. No, 



E. 2897), oral view, X2. Apical view of the same specimen shown 

 in Plate 5, Figure 3. 



Plate 8 



FiGTJBE 1. Eeterocentrotus trigonarius, Niuafoou. August 31, 1930 (U.S.N.M. 

 No. B. 2903), apical view, natural size. 

 2. Eeterocentrotus trigonarius, Niuafoou, October 6, 1930 (U.S.N.M. 

 No. E. 2918), apical view, natural size. Oral view of the same 

 specimen shown in Plate 4, Figure 2. 



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