Plate 31. 



1-4. Podophora pedifera Agass. 

 1-8. Sphaeridia. 



1. Sphseridia, the first measures 0.27 mm. in length, all from the right posterior ambu- 



lacrum. 



2. From the odd anterior ambulacrum, the longest measures 0.34 mm., the length of its 



mate is 0.29 mm. 



3. The first figure measures 0.28 mm., the second 0.19 mm., from the left anterior ambu- 



lacrum. 



4. From the left posterior ambulacrum, the first figure measures 0.26 mm. 



5-8. Podophora atrata Agass. 



5. Three sphaeridia from the right posterior ambulacrum, the middle one measures 0.26 



mm. 



6. From the odd anterior ambulacrum, the second figure measures 0.25 mm. 



7. Sphseridia from the left anterior ambulacrum, the third figure measures 0.26 mm. 



8. From the left posterior ambulacrum, the second figure measures 0.29 mm. 



The sphaeridia of 1-4 are from the same specimen, measuring 85 mm. in diameter, in- 

 cluding the spines, and those of 5-8 are from an individual measuring 77 mm. 

 The enlargement of the figures is about the same. 



