DANFORD : ^'OTES OX THE SPEETOX AMMONITES. Ill 
high up on Speeton Black Cliff Ridge. It therefore appears that 
S.S in the Russian deposits both forms are here represented. 
The upper part of the Jaculum-clays has, however, of late 
years been but poorly exposed, which partly accounts for my 
having found only very few of its Ammonites, and my inabilit}^ 
to give any additional information regarding their distribution. 
The remaining Ammonite genera of this zone are each 
represented by only a single species, Acantoceras (?) peltoceroides 
Pavl., and Desmoceras cf. cassidoides Uhl. Both seem to be 
rare, for of the former I have come across but one imperfect 
example near C9, and of the latter two fair specimens, one about 
the same horizon, the other much higher. 
Zone B (" Brunsvicensis Beds "). 
The soft brown nodules at the base of this zone sometimes 
contain specimens of Olc. {Simbirskites) discofalcatus or Phillipsi (?), 
but they are generally very ill preserved. Otherwise it seems 
to be quite devoid of Ammonites except in its uppermost beds. 
There Hoplites Deshayesi is common, but in a condition so 
decayed that even a fair example is a rarity. At the same 
horizon the small flat forms of Oppelia nisoides Sarasin are 
not rare, together with fragments of a distinct but apparently 
kindred species ; and occasional glimpses of beds only a little 
lower have showTi that they contain considerably larger 
Ammonites, very rotten, but which seem to be of the Deshayesi 
type. 
Zone A (" Minimus Beds 
In the beds with Bel. Ewaldi, which succeed those with 
H. Deshayesi, and which it is thought may (possibly with 
others still unseen) constitute a separate zone intermediate 
between the B and A zones, no Ammonites have yet been 
•detected, but in the Minimus marls Mr. Lamplugh has found 
H. interruptus Brug. If, however, more could be seen of the 
upper parts of the series than the patches now and again visible 
