101 
NOTES ON THE SPEETON AMMONITES. 
BY C. G, DANFORD. 
Anyone who knows a little about the Speeton sections 
can soon pick up a fairly representative series of their Belem- 
nites, but not of their Ammonites ; that demands much time 
and luck. Such at least has been my experience, for notwith- 
standing the exceptional opportunities for constant search 
afforded by several years' residence almost on the spot, I have 
not yet found some species, only poor examples of others, and 
—proof of the exhaustive character of Prof. Pavlow's and Mr. 
Lamplugh's museum and field researches — hardly any that 
cannot be identified from the descriptions and figures in their 
"Argiles de Speeton,"* to which work I am further indebted 
for the nomenclature and the classification of the seriesf used 
in the following slight sketch. 
The Ammonites at Speeton are not only in much worse 
condition than the Belemnites, but also far fewer, except in the 
Kimeridge, where their crushed remains are legion, while in a 
considerable part of the upper deposits there are apparently none. 
Of the 43 species described or figured in the "Argiles de 
Speeton, "{ all but four, representing as many genera, are in- 
cluded in Hoplites and Olcostephanus, the latter being divided 
* ''Argiles de Speeton et Leurs Equivalents," par A. Pavlow, et G.W. 
Lamplugh, Moscou, 1892. 
f The main divisions are indicated by letters, their sub-divisions 
by numerals. 
+ In the " Table of the Cephalopoda of the Speeton Series," 
(" Further Notes on the Speeton Section," &c., Q. J. G. S., vol. lii., 1896, 
p. 181), Mr. Lamplugh adds to these, HopUtes Mortelleti, Pict, and Lor., 
C8-11 ? , H. interruptus 1 Brug. A., Olcost. (Simbirskites) versicolor? 
Trautch., Olcost. ( — ) cf. Carteroni, d'Orb, CI to upper part of C6 ? , Oxy- 
noticeras cf. catenulatum, Fisch. D4-8. He also notes the probable pre- 
sence in D4 of Olcost. plicomphalus Sow. 
