PLATE 6. ‘S 
1-8. Echinonéus cycloarees LESKE. 
1.— Development of the coronal plates, seen from interior of an alcoholic specimen 
measuring 5.90 mm. long. Jamaica. 
2.— Bivium and odd posterior interambulacrum, seen from interior of a specimen measurin| 
long. Jamaica. - 
3.— The same, from a specimen measuring 6 mm. long. Jamaica. : 
4.— The same from a specimen measuring 14mm. long. Jamaica. ~ 
5.— The same from a specimen measuring 22 mm. long. Jamaica. 
6.— The same from a specimen measuring 25 mm. long. Jamaica. 
7.— Bivium and odd posterior interambulacrum, seen from interior of : 
long. Makemo Island, Paumotu Islands. : 
8.— The same from a specimen measuring 27 mm. = 
larger scale. 
