102 DAXFORD : NOTES OX THE SPEETOX AMMONITES. 
by Prof. Pavlow into six groups, or sub-genera, Virgitates^ 
Craspedites, Polyptichiies, Holcodiscus, Astieria, Simbirskites. 
The Hoplites occupy the lower part of the upper Kimeridge, 
the extreme top of " the Lateralis zone " D, the lower part 
of " the Jacidum zone " C, the top of " the Brunsvicensis zone " 
B, and " the Minimus zone " A ; the Olcostephani, occur hi the 
upper Kimeridge, the Coprolite Bed E, the entire Jaculum zone, 
and the extreme base of the Brunvicensis zone. The species not 
included in these two genera occur in the Kimeridge, the middle 
of the Jaciduw., and the top of the Brunsvicensis zones. 
Zone F (Kimeridge Clay). 
The greater part of the Kimeridge is terra incognita, for 
there is no record of its base and middle having been seen even 
by the earlier collectors, though they appear to have been 
vouchsafed better exposures of these shales than their suc- 
cessors. 
The beds with Amm. hiplex {= Peris phinctes lacertosus) 
Amm. evalidus { = Hoplites eudoxus), together with other fossils 
described by Leckenby, and those from which Mr. Herries 
subsequently collected the same species are the lowest that 
have been observed. Among their Ammonites preserved in 
various museums, Prof. Pavlow recognises H. pseudomutahilis 
Loriol and H. sabundorce Pavl. 
During the earh^ part of the i)resent year there were several 
slight and fugitive exposures of these deposits 200 to 300 yards 
north of Reighton Gap, i.e., about half a mile from Speeton 
]\Iiddle Cliff Ridge, at the base of which the Kimeridge and 
the Coprolite seam above it are always more or less visible. 
A striking feature of the most northerly was a band of septarian 
nodular matter about a foot thick, which rested on greenish- 
black shale. This band at first showed as an almost unbroken 
reef, but was soon breached by the heavy seas, so that if seen 
again at the same spot it will not present its original continuous 
appearance. The beds below it were alternately greenish- black 
