LOWER CRETACEOUS FOSSILS — ETHERIDGE. 323 



by faint, posteriorly-directed cinctures, and separated from the 

 remainder of the posterior ends by curved, rounded, but at the 

 same time prominent diagonal ridges. Cardinal margins wide, 

 but hardly as wide as the valves ; umbos tumid, depressed, and 

 faintly prosogyrate, quite anterior but not terminal ; ai'ea long 

 and narrow, with straight ligamental furrows ; hinge plate nari'ow, 

 with four and perhaps five short, oblique, inwardly directed 

 anterior denticles, and five long upwardly and outwardly directed 

 posterior denticles, the whole of them transversely striate. Ad- 

 ductor scars faint. Ventral margins gently rounded. Anterior 

 ends short, steep, the margins well rounded but not oblique ; 

 posterior ends forming quite two-thirds of the valves, at first 

 tumid, but beyond the diagonal ridges flattened and alate, the 

 margins obliquely truncate above, and rounded below. Sculpture 

 of concentric lines at irregular distances apart and of varying 

 strength, crossed by fine radiating costa?, alternately larger and 

 smaller producing an ill-defined cancellation ; the costte in and 

 around the cincture are stronger than the remainder. 



Ohs. — I employ the name Grammatodoii as originally intended 

 by Messrs. Meek and Worthen, and as distinct from their 

 Parallel odon}^^ At the same time I do not feel entirely satisfied 

 that the present shell is a Grammatodoii in consequence of the 

 oblique j^osterior teeth rather than the latter parallel to the 

 cardinal margins, and also from the fact that all the denticles are 

 transversely striate. In the possession of this striation it re- 

 sembles a Cretaceous genus of Conrad's Polynana. 



In some respects G. (? ) daintreei resembles a previously described 

 Barbatia-Vike Arc — Cvcnlla^a hendersoiii, mihi," from the Lower 

 Cretaceous of the Tambo District, Queensland, which, I regret, I 

 am unable to compare with it. In the species mentioned the 

 umbos are so much more central, and without umbonal cinctures 

 that I think the two shells can hardly be identical. 



G. (?) daintreei is associated with Ai(cella hicykendenensis. 

 Named in honour of the late Richard Daintree, C.M.G., a former 

 Government Geologist of and Agent-General for Queensland. 



1'' Parallelodon, M. and W. = Macrodon, Ljcett {non Midler), Macrodus, 

 Beushaiisen, and Beushausenia, Cossman. 



" Ethei-idge— aeol. Pal. Q'laiid, etc., 1892, p. 468, pi. xxvi., f. 2 and 3. 



