Plate 6. 



1-17. Podophora pedifera Agass. 

 1-17. Exterior views of valves of Opbicephalous pedicellariae. 



1. A valve 0.35 mm. adjoining the teeth, from a specimen 73 mm. in diameter. 



2. A valve 0.44 ram. adjoining the teeth, fiom a specimen 75 mm. in diameter. 



3. A valve 0.36 mm. adjoining the teeth, from a specimen 82 mm. in diameter. 



4. A valve 0.53 mm. from the right posterior ambulacrum, near the ambitus, of a speci- 



men 68 mm. in diameter. 



5. A valve 0.59 mm. from the right anterior ambulacrum, midway between the actinal 



system and the ambitus of the same specimen as 4. 



6. A valve 0.55 mm. from the left anterior ambulacrum, near the actinal system of the 



same specimen as 4. 



7. A valve 0.57 mm. from the right posterior interambulacrum, near the actinal system of 



a specimen 72 mm. in diameter. 



8. A valve 0.59 mm. from the left anterior interambulacrum, near the actinal system of 



the same specimen as 7. 



9. A valve 0.57 mm. from the right anterior ambulacrum, midway between the actinal 



system and the ambitus of a specimen 73 mm. in diameter. 



10. A valve 0.48 mm. from the right anterior ambulacrum, at the ambitus of a specimen 



75 mm. in diameter. 



11. A valve 0.59 mm. from the odd anterior ambulacrum, midway between the actinal system 



and the ambitus, of the same specimen as 10. 



12. A valve 0.61 mm. from the odd posterior interambulacrum, near the ambitus, of the 



same specimen as 10. 



13. A valve 0.57 mm. from the odd posterior interambulacrum, near the actinal system of 



a specimen 77 mm. in diameter. 



14. A valve 0.54 mm. from the left anterior interambulacrum, at the ambitus of a specimen 



82 mm. in diameter. 



15. A valve 0.56 mm. from the right posterior ambulacrum, midway between the actinal 



system and the ambitus of a specimen 85 mm. in diameter. 



16. A valve 0.48 mm. from the odd posterior interambulacrum at the ambitus of the same 



specimen as 15. 



17. A valve 0.38 mm. from the left posterior interambulacrum at the ambitus of the same 



specimen as 15. 



The measurements of the diameter of the test include the spines, with the exception of 

 1, 2, 4, 6, 6, 14, and 15, which are denuded. The corresponding valve was selected for 

 each figure. The figures are about equally magnified with the exception of 1-3, which 

 are somewhat larger. The dimensions given of the valves of the pedicellaria; are natural 

 size. 



Outer reef, Fakarava, Paumotus, " Albatross" Ex., 1899-1900. 



