On Two New Species of Spirillum

Abstract

Two new species of Spirillum have been isolated from the putrid media in which the putrid bodies of two species of the fresh water shell fishes, Corbicula japonica Prime and Cipangopaludina malleata (Reeve) laid. On the basis of the morphological, cultural and physiological characteristics, the spirillum isolated from Corbicula japonica Prime is diagnosed as a new species, and it is named Spirillum metamorphum from its metamorphosis; and also the spirillum isolated from Cipangopaludina malleata (Reeve) is diagnosed as a new species and named Spirillum crassum because it has a stout cell.