54 : 
Spath — A)nmonites from the Gingin Chalk. 
synonym. ~Mr. F. W. Wliitohouse, is now revising the am- 
monite-fauna of tlie Kolling Downs Beds of Queensland, and, as 
the writer" mentioned in a recent paper, the occurrence of Aptian 
fossils togetlier with CJpper Al])ian forms, has hitherto prevented 
a correct identification of tlie Australian species. The true 
affinities of tlie Desmoceratids, descrilied by Etheridge will thus, 
no doubt, soon be established, and it is clear that their resem- 
lilance to some of the Gingin Chalk forms is only superficial. 
Another of Etheridge’s examples was compared to Amm. 
pcrampliLs Sharpe, non Alantelll ; and a fourth, globose, species 
was considered to lie entirely distinct, but from the description 
may also be a Pachydiscid. 
riie two examples under examination are also poorly pre- 
served and, altliough recognisalile at first siglit as Pachydiscids 
and supei-ficially resembling Parhgdi.^eus pcramplus^ tliey cannot 
easily referred to any one of the numerous genera of this family. 
Pupachydiscus^ with similar jierioilic strengthened ribs, on the 
wliole, seems the most likely group, i.e., the lineage including P. 
ificulcnsis (Kedtenliacher) and E. jcaiii (Grossouvre) t which, prob- 
ably, also includes PacJi ydi.sciis luimdai Jimbo, for which Yabe. in 
1924^ used the name ' ^ ('■'^opachydiscii.H. ’ ’ 
Until the Japanese forms are described and their horizons are 
known, definite identification and correlation are impossible. As 
it is we can only state that the two examples appear to belong 
tn two separate species, and that the ammonite evidence supports 
^Ir. Witlier’s vieAv of the Santoniau age of the Gingin Chalk. 
In a recent pajier on '*Xew Ammonites from the English Chalk”t^ 
the writer correlated the lower ])art of the zone of Marsiipites 
trsfudhuirius (or Uiutacrinu.^ bed) with the Upper Mortoniceratan 
age, characteriseil in England by the (rare) occurrence of 
Parapiwo.Kia {IcpfdophylUi grou])). The iireseiice of comparable 
fonns^ in the Gingin ('halk jirobably ex])lains the identification, by 
Etheridge, of some of Ms exanpiles with earlier species of 
“ Puzosids.” 
From the zone of Mivmster cor^anguinum^ beloAv the 'Uintacrinus 
* (O'oloMcal ira^i'azinc, Feijniarv. H)2(> 
s/iar/>n- ’ ' “ ' ' ’ i'ackydiscus 
' ,:arnr'‘;f^rr‘ i-U i''”''*"'-'-*-'’ Tra„s. 
Jr™::"!" 
