In a paper published in April, 1910, I described and figured a new intracorpuscular parasite found in smears made from the spleen and liver of a jackal (Canis adustus), the animal having been shot by Mr W. F. Cooper in British East Africa. As I stated at the time, I hesitated about referring the parasite to the genus Piroplasma, and only did so provisionally because it offered a resemblance to two parasites found in the internal organs of one of my dogs which had “recovered” from P. canis infection. I, however, added: “Should future investigation prove that the parasite of the jackal differs from the types of P. canis encountered in ‘salted dogs’ I would propose to refer it to a new genus, Rossiella (Rossia being preoccupied) in view of its specific name.”