348 PKOCEEDINGS OF THE GEOLOGICAL SOCIETY. [April 24, 



hinge-line also and place of the hinge-area help us to assign this 

 to the genus named ; the impressions of some eight or ten ribs 

 are distinguishable from the umbo to near the ventral margin of the 

 shell. I was in doubt as to whether the slightly intermittent lines 

 might not have represented the granulated surface or pitted struc- 

 ture of some Myacites ; I however refer it to the above genus. 

 Loc. Gordon Downs. Form. Lower Oolite. 



Myacites, sp. ? PI. XXV. fig. 7. 



This widely distributed genus occurs in grey and red sandy 

 limestone at Gordon Downs ; but I cannot specifically name either 

 of the specimens in the collection : they are merely casts, and may 

 be referred to many such occurring in the Lower Oolitic rocks of 

 Britain ; they are associated with other forms occurring in the 

 Inferior Oolite of Europe. Externally the casts resemble those of 

 Myacites tenuistriatus and M. recurvus ; and a portion of the shelly 

 structure remaining appears to be the same. It is essential that 

 these forms should be mentioned and figured, owing to their position ; 

 and they are undoubtedly of the age assigned to them, whatever 

 relation the deposits may have to those of Europe in time. 



Loc. Gordon Downs. Form. Lower OoUte. 



Myacites allied to M. tenuistriatus. 



In the absence of all other evidence I refer this cast to the above 

 species ; in all essential particulars it is that to which we refer 

 those forms in our own Oolitic rocks that have been denuded of 

 their shell, and which, by close comparison, agree with the known 

 determined species. 



Loc. Gordon Downs. Form. Lower Oolite. 



Tanckedia, sp. ? PI. XXV. fig. 8. 



The subequilateral, transverse, and donaciform shape of this cast can 

 only, I think, be referred to the genus Tancredia, Lycett {Hettangia, 

 Ter-quem). No teeth, true hinge-line, or entire pointed anterior 

 extremity are seen ; but the aspect of the shell favours this belief. 

 It, however, resembles some forms of Corbis. It may be referred to 

 C. (Corbiella) hathonica, Lycett. Like the other casts from the 

 Lower Oolite they are named to draw the attention of Queensland 

 geologists to the Gordon-Downs fossils. 



Loc. Gordon Downs. Form. Lower Oolite. 



Note. — Since my Appendix has been in type I have examined 

 another large series of fossils from Queensland, forwarded by Mr. 

 "William Hann. Nearly the whole are Cretaceous, and agree in facies 

 with the Marathon and Hughenden series just described. The lo- 

 calities from which they are derived are Bowen Downs, head of 

 Thompson Eiver, Tower Hill, and Barcoo-River beds near Tambo. 



The fossils from Bowen Downs occur in lat. 23° S. and long. 145° E. 



