SOME OBSERVATIONS ON CRISTISPIRA IN THE CRYSTALLINE STYLE OF SAXIDOMUS GIGANTEUS DESHAYES AND IN THAT OF SOME OTHER LAMELLIBRANCHIATA

Abstract

The occurrence of a spirochaete of the genus Cristispira in the crystalline style of Saxidomus giganteus Deshayes is recorded. The distribution of the organisms in the style, and the possible reasons for their absence in the anterior region of it, are discussed. It is found to be a facultative anaerobe. Observations are recorded on the infection of newly regenerated styles, and occurrences of Cristispira in styles of species of Lamellibranchiata other than Saxidomus giganteus, and of their absence elsewhere, are summarized.