17 
(40, 45, 60, — ,)?; F. 66, 45-5, 53, 13*5. Ribbing and umbilicus also 
separate the English shell from Ammonites (Macrocephalites) ishmae 
Newton (“inflated variety”)* The proportions of this are F. 34, 47, 70, — ; 
59, 49, 66, 13*5. 
A MACROCEPHALITE 
(Plate III, figure 14) 
When the writing of this paper was commenced nothing from English 
strata comparable with Miccocephalites was known to me. But lately 
Dr. Edgar Dacque of the Palaeontological Museum, Munich, has most 
kindly sent me for study several of Oppel's types and among them his type 
of Ammonites galilaei 1 . This specimen came from Chippenham, Wiltshire, 
England; its matrix is Kellaways Rock of a bluish colour; oysters and 
other lamellibranchs and small gasteropods are in it. There is also included 
a lump of light blue clay. The colour and condition of the matrix, as well 
as the included fauna, are different from the usual characters of Kellaways 
Rock specimens. The included clay strongly suggests that it comes from 
the basal part of the formation and there are many reasons for thinking 
that it may represent a deposit earlier in date than I have yet noted in my 
division of Kellaways Rock. 
In the body-chamber of Ammonites galilaei is a fragment of the body- 
chamber of a Macrocephalitid with ribs curving over the venter convexly 
forward. It agrees, therefore, in such character with the Macrocephali 
curvicostati of Waagen and with Miccocephalites ; but it differs from the 
latter by showing ribs which are not so curved on lateral area and not so 
distinctly laminate. 
This interesting find confirms the statements which have been made 
that “ Ammonites macrocephalus ” ranges from the Cornbrash to the Kella- 
ways Rock in England. The range to the Kellaways Rock had been 
regarded with some scepticism, even when the term Am. macrocephalus 
was translated into Macrocephalites : inexactitude in identification was 
suspected — it is only too well known in so many cases. 
1 Figured, Type Ammonites, IV, 1922, PI. CCXC. 
