The death of R. A. S. Browne on 26th June, 1947, deprived New Zealand of its only active worker on ammonites. As a young man, Browne was interested in these fossils, and specimens collected by
him were described by the late P. Marshall as early as 1909. Incidentally, Aulacosphinctoides brownei (Marsh.) from the upper Jurassic of Kawhia bears his name. He did not take up their serious study, however, until more leisure came his way thirty-five years later. In March, 1944, Mr. M. T. Te Punga discovered ammonites at Beaumont Stream, near Ohai, in Southland, and his specimens were forwarded to Mr. Browne early in 1945.
Subsequent collections were made by Mr. J. Fraser, of Beaumont Station, and by members of the Geological Survey, chiefly by Mr. M. V. Rout, but also by Dr. A. R. Lillie, Mr. H. J. Harrington, and Mr. R. W. Willett.
Ammonites were recorded by Hector (1869: vi) from Morley Stream, but the only ammonite remaining in G.S. coll. 144 is unidentifiable and the precise locality is unknown.
The paper had not been completed at Browne's death, but the names and formal descriptions as they appear above had been written out by him, also some introductory notes. Some additional species and another two new genera had been recognized, but the writer has exercised the normal duties of an editor in collating manuscript, and has included only such manuscript descriptions as could be found to be supported by specimens.
One modification that may be mentioned is in the generic placing of Leiophyllites marshalli. This had been described by Browne under Monophyllites. Unfortunately, he had not come across L. F. Spath's (1934) invaluable revision of the Triassic Cephalopods in the British Museum. This work would have given him enormous pleasure. On the information set out by Spath, the writer has modified Browne's classification and used Leiophyllites.
According to Spath's work, the age significance of the genera identified is as follows: