342 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. f April 24, 



rounded, and the posterior more acute. I figure this specimen, but 

 venture not to give it a name until more perfect specimens occur. 

 Loc, Maryborough. Form. Cretaceous. 



AvicuLA ALATA, Ether. PL XX. fig. 8. 



Shell inequivalve, inequilateral ; auricles unequal, posterior much 

 expanded, anterior small ; hinge-line straight, umbones acute and 

 prominent, umbonal region thick ; valves with numerous (34) radi- 

 ating ribs, with alternating smaller ones, except near the middle of 

 the valve, where the ribs (7 and 8) are all equal, and range from 

 the umbo to the ventral margin. 



We have no means of ascertaining the character of the hinge- 

 line or teeth, the ligamental area being concealed in the matrix ; and 

 the shell-texture is absent, or wanting. 



Loc. Maryborough. Form. Cretaceous. 



Natica lineata. Ether. PL XXI. fig. 1. 



Shell globose, spire depressed, consisting of three or four volutions, 

 sutural line deep ; aperture large and oval ; body-whorl large, rapidly 

 increasing in size, strongly rugose, or varied by lines of growth. 



Ohs. This shell closely resembles N. gaultina, from the Gault of 

 Folkestone, also from the Greensand of Blackdown. It may be the 

 Natica variabilis, Moore, figured as coming from the WoUurabilla 

 beds, which it most resembles. I cannot, however, satisfy myself 

 that it is the same shell, and, therefore until better specimens are 

 obtained, retain the name. 



Loc. Maryborough. Form. Cretaceous. 



Panopjea sulcata. Ether. PL XXI. figs. 2, 2 a. 



Shell oblong, transversely or ovately elongated, thin, with many, 

 concentric, deeply sulcated plications or furrows ; umbones pointed, 

 anterior side much rounded, posterior side acute. 



Ohs. This shell resembles P. orientalis, Eorbes*; but the concen- 

 tric sulcations are fewer and coarser, the posterior margin is more 

 acute, and the umbones slightly more central. It also much re- 

 sembles P. Prevosti, D'Orb. ; but our shell is more coarsely plicated 

 than either of the above-named species. 



Loc. Maryborough. Form. Cretaceous. 



Panop^a (Mya) plicata. Sow., var. acuta. Ether. PL XXI. figs. 

 3, 3 a. 

 Bef. Min. Conch, vol. v. p. 20, pi. 419. f. 3. 



A variety of this common and well-known European shell is 

 evidently abundant at Pelican creek, and is, with one other ex- 

 ception, the only British Cretaceous species we have met with in 

 the Queensland collection. P. sulcata, mihi, from Maryborough, 

 differs much from this shell, although individuals of both sexes are 

 frequently crushed and distorted. To what particular horizon in 

 the Cretaceous series to refer this variety of P. plicata. I cannot 

 * Prom Pondicherry (Trans. Geol. Soc. ser. 2, vol. vii. pi. 17. fig. 4). 



