The repeated isolation of a haemolytic species of Haemophilus requiring V factor and preferring increased CO tension for growth is described. Other characters helpful in establishing the identity of such strains are given and the name Haemophilus paraphrohaemolyticus is proposed.

We acknowledge the competent assistance of Miss W. B. Walsh in the photographic part of this work.

The three strains on which this report is based have been deposited with the National Collection of Type Cultures, Central Public Health Laboratory, London; they have been allotted the following numbers: strain Corinthian, NCTC no. 10672; strain Lawton 1, NCTC no. 10670; strain Lawton 2, NCTC no. 10671.


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