Ultrastructural study of vanadocytes in Ascidia malaca

Summary The ultrastructural aspects of vanadocytes, found in the circulating blood of Ascidia malaca, were studied in formaline-fixed material. The results indicate that the diverse morphological aspects of vanadophores reported here, are probably concerned with different metabolic stages of vanadine.This work was supported by a grant from the University of Naples at the Zoological Station of Naples.