PLATE 24. 
1-7. Echinonéus cyclostomus Lesxkr. 
Odd anterior ambulacrum. 
1.— From test 6 mm. long, 
2.— From test 8 mm. long, 
3.— From test 9.5 mm. long, 7 ; 
4.— From test 11 mm. long, Bort Snionio, Jamnateee 
5.— From test 16 mm. long, 
6.— From test 18 mm. long, 
7.— From test 27 mm. long, Pacific (?). 
Increase of the primary tubercles is indicated by numbers and letters. 
Figures 6-7 are reduced in magnification, the others in relative size. 
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