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MEMOIRS OF THE QUEENSLAND MUSEUM. 
Two other coincidences may be noted about these spirals generally 
1. The two forms most similar (the Queensland and the Wealden 
specimens) are comparable in age ; 
2. Excluding the North Sea form the derivation of which is unknown, 
all these large spirals seem to occur in lacustrine or estuarine 
beds. 
The first of these coincidences may suggest an organic origin — that the 
two forms are species of the one genus (Dinocochlea) of obscure relationships. 
If so, considering the Queensland evidence, Woodward’s suggestion of a 
gastropod would be untenable. However, with only v two occurrences for a 
problematical structure it would be unwise to stress this point of view 
On the second coincidence too it is probable that little weight should be 
placed ; for the twofold form of Daemonhelix (the spiral and the lateral 
processes) suggests an origin different from that of the other and simpler forms. 
Thus the problem of the origin of this spiral cannot be decided on the 
evidence available. No proffered explanation is free from grave objection, 
and it would be useless at present to press the claim of any one theory as a 
valid explanation of such a puzzling form. 
References. 
Ammon, L. von., 1900. “ Ueber das Vorkommen von Steinsrauben ( Daemonhelix ) in der oligocanen 
Molasse Oberbayers ” (Geogn. Jahreshefte, 13 Jalirg., pp. 55-69). 
Barbour, E. H., 1892. “ Notice of New Gigantic Fossils.” (Science, vol. 19, pp. 99-100). 
Buckland, W., 1835. “ On the Discovery of Coprolites or Fossil Fasces in the Lias at Lyme Regis ” 
(Trans. Geol. Soc. Lond., Ser. 2, vol. 3, pp. 223-236). 
Cox, L. R., 1929. “ A Spiral Puzzle ” (Nat. Hist. Mag., vol. 2, No. 9, pp. 16-27). 
Longman, H., 1933. “ A New Dinosaur from the Queensland Cretaceous ” (Meins. Q’land Mus., 
vol. 10, pt. 3, pp. 131-144). 
Whitehouse, F. W., 1928. “ The Correlation of the Marine Cretaceous Deposits of Australia ” 
(Rept. Aust. Assoc, for Adv. Sci., vol. 18, 1926, pp. 275-280). 
Wood, H. E., and Wood, A. E., 1933. “ Daemonhelix in the Pleistocene of Texas ” (Journ. of 
GeoL, vol. 41, pp. 824-833). 
Woodward, B. B., 1922. On Dinocochlea ingens n. gen. et sp., a Gigantic Gastropod from the 
Wealden Beds near Hastings ” (Geol. Mag., vol. 59, pp. 242-248). 
EXPLANATION OF PLATE XXXII. 
Figs, la, 16. Two views of the large spiral structure, (a) lower surface ; (6) lateral view. The 
dotted line marks the break from which portion of the specimen is missing. 
Figs. 2, 3, 4. Nodular masses associated with the spiral structure. 
(Figures are reduced according to the scales shown.) 
[End of Part IV. of Volume X, Memoirs of the Queensland Museum.] 
tflf 
David Wiiyte, Government Printer, Brisbane. 
