232 PROCEEDINGS COTTESWOLD CLUB 1906 
dwarfs, and nearly all must be added to Hyatt’s list. 
With other species which were not noted by these authors, 
and with those which have been named since, it may 
reasonably be surmised that the genus Sch/othezmza con- 
tains nearly 50 species. Of all these forms only 6 were 
recognised as British by Wright’ ; but that states the case 
inadequately to our present knowledge. We can now 
note some 27 species as British. The difference between 
these numbers is but an imperfect measure of how much 
remains to be done before the Ammonite fauna of the 
British Lias is adequately described and figured. For the 
present investigation was primarily concerned only with 
the small species allied to S. d/acunata, because Mr 
Richardson had discovered several forms which he wished 
to record; and little attention was given to the large 
species of the angudatus-group—little more than to in- 
clude a few notes made during the course of various 
researches to simplify a somewhat complicated synonymy. 
For assistance in this investigation my cordial thanks 
are due to Mr J. W. Tutcher, for the trouble he has taken 
to give such excellent photographs; and also to him, to 
Dr Charles Schuchert, Yale University Museum, U.S.A., 
Dr F. L. Kitchin, Jermyn Street Museum, London, Mr H.° 
Woods, M.A., F.G.S., Sedgwick Museum, Cambridge, 
Mr L. Richardson, and Dr A. Vaughan, F.G.S., for the 
kind loan of various specimens. 
Affinities and Development. 
Schlotheimia is connected by its suture-line with the 
genera Pszlonotoceras, Quenstedt (Psz/oceras being invalid 
through prior use); Wehneroceras, Hyatt; Caloceras, 
1 Monogr. Lias Ammonites (Pal. Soc.) 
