LOWER CRETACEOUS FOSSILS — ETHERIDGE. 143 



smooth, the following whorls gradually acquiring costse as growth 

 went on. These he separated as Leptoceras, and one of our 

 smallest species appears to me to fulfil these conditions, viz., 

 C. edkinsi, mihi. 24 



As Hyatt did not live to elaborate his classification, it is my 

 intention, in the following pages, to refer the whole of the Aus- 

 tralian forms to Crioceras, with the exception of the species just 

 mentioned. When the limits of Crioceras have been de6ned by 

 those with large collections at their disposal and access to the old 

 types, it will be possible to relegate our local species to their 

 respective groups. 



Genus Crioceras (LeveWe), D'Orbigny, 1842. 25 



Crioceratites, Leville, Mem. Soc. Geol. France, ii. 1836, p. 313 



(fide D'Orb.). 

 Crioceras, D'Orbigny, Pal. Franc. Terr. Cret. i. (Ceph.), 33-42 



1842,-''' p. 457. 

 Ancyloceras, D'Orbigny, ibid., p. 491. 

 Ancyloceras, Astier, Ann. Sci. Phys. Nat. Soc. Nat. Agric. Lyon, 



'(2), iii., p. 435. 

 Crioceras, Neumayer and Uhlig, Palaeontographica, xx\ii., 3, 



1881, p. 181. 

 Crioceras, Uhlig, Denk. K. Akad. W'iss. Wien, xlvi , 2, 1883, 



p. 258. 



Crioceras, Haug, licitriige Pal. Ost.-Ung. Orient, \ ii., 3 and 



4, 1888, p. 2u6. 

 Ancyloceras, Haug, ibid., pp. 211 and 214. 

 Crioceras, Anthula, ibid., xii., 3, 18U9, p. 124. 



Crioceras(T) leptus, 27 sp. nov. 



(Plate xxx.; Plate xxxiv., fig. 2.) 



Sp. Chars. — Size of shell unknown. Venter rounded, narrow; 

 abdominal margins rounded ; dorsum flat, costate ; impressed 



'■^Etheridge— Geol. Pal. Q'land, etc., 1S92, p. 502, pi. xxx., figs. 8 and 9. 



25 As an addition to Mr. C. D. Sherborn's remarks (Geol. Mag., (4), vi., 

 1899, p. 223) on the dates of publication of the "Livrasons" of D'Orbigny's 

 Cephalopoda (Pal. Franc.) I would point out that Bronn (Index Pal., i. , 

 1848, p. 348) gives 1840 as D'Orbigny's date of Crioceras. It may also be 

 mentioned parenthetically that the latter in one publication (Pal. Franc. 

 loc. cit., p. 459) gives Leveillc's date as 1836, and in another (Prod. Pah, ii., 

 1850, p. 65) as 1837, whilst Bronn (loc. cit.) as 1835. 



26 Date^e Sherborn. 



