26 
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POSTSCRIPT 
The foregoing paper was written and left my hands in March, 1922. 
Since then much work has been done in the determination and chronology 
of the Macrocephalitidae, so that some of the information can be revised 
and stated with greater certainty. A postscript seems the most desirable 
method of bringing the information up to the present time, November, 
1924, 
Species of Macrocephalitidae belong to several dates, being found in 
the following rocks in descending order. 
(6) Kellaways Rock, Wiltshire, Gasteropod bed — near base of the rock — 
a Macrocephalitid fragment. See Type Ammonites, PI. ccxc. 
(5) Kellaways Sand, South Cave, Yorkshire, possibly equivalent in date 
to the basal Kellaways Rock of Wiltshire — possibly earlier than 
deposit No. 6. Catacephalites durus, Type Ammonites, PL cclxxxiii. 
(4a) Kellaways Clay, Wiltshire — presumably a very early phase of this 
deposit. Pleurocephaliles, Type Amm., cclxxxiv, cccxlviii ; Tmeto- 
kephalites, Type Amm., cdxxxiii. This is probably the horizon of 
Tmetokephalites of the Continental Callovian and also of Macrocepha - 
lites from there. 
(4) Clay above Combrash, Dorset, possibly synchronous with the Kella- 
ways Clay No. 4a, but also poss bly earlier. Macrocephaiiceras, Type 
Amm., cccxiii. 
