A New Ammonite from Queensland. 143 



Affinities. — Tliis specimen is most nearly related to the Am- 

 monite from the cretaceous of Southern India, described as 

 A. beudanti,^ and to the A. flindersi, McCoy,- from Queensland. 



It differs from both those Ammonites as in it 



1. The form is more laterally compressed. 



2. The mouth is higher and narrower. 



3. The notches in the lobes are not so sharp and are less 



numerous. 



The full descriptions by Mr. Etheridge, jar.,'' of Haploceras dain- 

 treei, Eth.^, suggest that it may be even nearer to the new species. 

 The new species, however, has a greater complexity of sutures, 

 and the saddles are wider proportionally to the lobes, than is the 

 case in H. daintreei. H. daintreei moreover is thicker and 

 broader, with a shorter apertui'e and deeper umbilicus.'^ Our 

 Desmoceras is allied to the above two species, but its generic 

 position is with Desmoceras rather than Haploceras with which 

 the two well known Queensland forms have been placed. 



Von Zittel's description of his genus Haploceras, states" it 

 differs from Desmoceras by the first lateral saddle projecting 

 extensively beyond the line of the rest of the .saddles. In this 

 character our species is a typical Desmoceras. Probably some of 

 its nearest Queensland allies, as the species flindersi and dain- 

 treei, belong to the same genus. 



We pi'opose to name the new species jonesi, after Mr. J. W. 

 Jones, the Conservator of Water in South Australia, whose work 

 has thrown so much light on the water distribution in the 

 Cretaceous rocks of Central Australia. 



1 Stoliczka, F.: Cretaceous Cepbalojiofis of S. India, I'al. Indica, vol. i., p. 143, pi. Ixii., 

 fi^'S- 1— t, and pi. Ixii. 



^ McCoy, F.: Trans. Roy. .Soc. Vic. 1S66, vii., p. 51. Ibid., 1868, viii., pt. i., p. 42. See 

 also Etheridg-e, R., junr. : Additional Notes on the Palaeontolojfy of Queensland. Bull : No. 

 13, Geol. Surv. Queensland, pt. ii., 1901, p. 31. 



3 R. Etherid;^'e, Jnr. Oy. cit, pp. 30-31. 



■i R. Etheridire, .Senr. : Description of the Palaeozoic and .Mesozoic Fossils of Queens- 

 land. Quart. .Jourii. Geol. Soc, xxviii., 1872, p. 346, pi. xxiv. 



^ c./. Fig. R. Etheridsre, Jnr. Loc. cit., pi. ii., fig. 6. 



c «.(/. Grundzuge der Palaeontologie, 189.5, yi. 426. 



Ilu ( L I B R A R Y 



TT^T^v^?^^ 



