1. It has been shown on serological and biochemical grounds that Str. faecalis falls into Lancefield's group D. Str. liquefaciens is considered to be a variety of Str. faecalis, and Str. glycerinaceus (Orla Jensen) has insufficient claim to a separate name.
2. Str. lactis has, on biochemical and serological grounds, been clearly differentiated from Str. faecalis and the other members of group D.
3. Reasons are given for assigning Str. lactis to a new serological group ‘N’ into which Str. cremoris also falls.