112 DANFORD : XOTES ON THE SPEETON AMMONITES. 
along the base of the chif south of Speeton Beck, or their very 
partial and rare exposures on the shore, other species might 
doubtless be added to the meagre Hst that they have hitherto 
furnished. 
Note on Crioceras. 
The Criocerata of the Speeton clays do not seem to have 
been so thorouglily exploited as the other cephalopods, pre- 
sumably because their forms being less compact, have been 
so badly preserved that even moderately good examples of 
most of them are rarely obtained. 
Their range as at present known is from Bed 2 of " the 
Lateralis zone " to nearly the top of " the Brunsvicensis zone," 
and probably extends at least to the base of the minimus marls. 
The form of Crioceras in D2 resembles one of large size 
common in the lower part of " the Jaculum zone," which I 
think has been determined as C. Duvali. In that zone these 
fossils are most abundant in the middle beds, where they some- 
times lie in almost continuous bands. None is more numerous 
than C. semicinctmn, and the above-mentioned large species, 
while among others C. puzosianum and Hamites intermedins 
are sufficiently common. In this zone C. Matheroni is also 
found, but apparently only in the upper beds. 
In the " Brunsvicensis zone," though Ammonites are so 
rare, there are many Crioceras. A small species like C. Matheroni 
occurs at its base, and in its lower beds C. Strombecki is common. 
The somewhat higher beds, and their bands of large nodules, 
contain many Crioceras, but they are either very rotten or 
very hard to extract. The Deshayesi beds have also large and 
small forms, which do not appear to occur elsewhere. Among 
these are Toxoceras Royeri d'Orb. and two species of Ancyloceras, 
considered by Dr. A. von Koenen to be undescribed. 
The only fossil of this group which I have come across at 
an horizon which may be above the level of " the Brunsvicensis 
zone " was in a large nodule high up on Black Cliff. This 
