Plate 22. 



1-10. Podophora atrata Agass. 



1. From a specimen 12 mm. in diameter, including the spines. 



2. From a specimen 14 mm. in diameter, including the spines. 



3. From a specimen 18 mm. in diameter, including the spines. 



4. From a specimen 26 mm. in diameter, including the spines. 



5. From a specimen .31 mm. in diameter, including the spines. 

 G. From a specimen 35 ram. in diameter, including the spines. 



7. From a specimen 46 mm. in diameter, including the spines. 



8. From a specimen 67 mm. in diameter, including the spines. 

 .9. From a specimen 74 mm. in diameter, including the spines. 



10. From a specimen 77 mm. in diameter, including the spines. 



The figures show the order of growth of the spines ; the same view is given for each spe- 

 cimen, showing the left posterior ambulacrum, the odd posterior iuterambulacrum in the 

 center, and one half of the right posterior ambulacrum. 



The dotted lines join the radioles of the same vertical row. 



Hawaiian Ids., A. Garrett Coll. 



