In the course of the examination of the contents of the paunch and rumen of 70 Ruminants a Ciliate of an interesting type has been met with on eight occasions. It is surprising that a new form should be found in this situation as a number of workers seem to have devoted no little time to researches on the fauna of the ruminant stomach. One cannot think that this animal is to be found only in England, and we are driven to the conclusion that it must have been overlooked up to the present. As the organism is relatively small for a Ciliate and of a rather transparent appearance this is understandable, especially because it is rarely abundantly present. Although it has been found eight times, yet in a coverslip preparation where there will be several specimens of the other Ciliates in every field of the microscope, there may not be more than one or two specimens of this new form.