ot 
PLATE 3. 
1-6. Dorocidaris panamensis A. Ag.; Station 3368. 
Denuded abactinal system of a specimen measuring 10 mm. in diameter. 
Denuded abactinal system of a specimen measuring 18 mm. in diameter. 
Denuded abactinal system of a specimen having 7 primary coronal plates, measuring 
30 mm. in diameter. 
Denuded-actinal system of the same specimen as fig. 3. 
Part of test, seen facing the odd anterior ambulacrum; same specimen as fig. 3. 
ie sco% 
-art of test, seen facing the left anterior interambulacrum; same specimen as 
