Platpj 10. 

 1-3. Porocidaris Milleri A. Ag. 



1. Seen facing the odd anterior ambulacriuii of specimen measuring 20 mm., having 5 



primary coronal plates, from Station 3399. Same as PI. 7, figs. 3, 6. 



2. Same as fig. 1, seen facing the left anterior interambulacruin. 



3. Lower part of primary interambulacral radiole of specimen measuring 33 mm. iu 



diameter ; Station 3415. 



4-9. Porocidaris Cobosi A. Ag, ; Station 3404. 



4. Seen facing the odd anterior ambulacrum of a specimen having o primary coronal 



plates, measuring 8 mm. in diameter. 



5. Seen facing the left anterior interambulacrum, same specimen as lig. 4. 



6. Seen facing the odd anterior ambulacrum of a specimen having 6 primary coronal 



plates measuring 21 mm. in diameter. The artist has omitted the lines joiniug the 

 pores, as in figs. 1, 2, 4, 8. j 



7. Seen facing the left anterior interambulacrum of the same specimen as fig. 6. 



8. Seen facing the odd anterior ambulacrum of a specimen having 7 primary coronal 



plates and measuring 35 mm. iu diameter. 



9. Seen facing the left anterior interambulacrum of the same specimen as fig. 8. 



The lines joining the pores have been omitted in figs. 5, 7, 9. 



