534 PALAEONTOLOGY OF QUEEXSLAXD, 



into the posterior margin ; ventral margin very gently rounded ; 

 anterior end small, its margin rounded ; posterior end flattened, 

 the margin insensibly passing into the dorsal and ventral outlines, 

 but more obliquely into the former. Umbones anterior, but not 

 terminal. Surface bearing concentric corrugations or rugae, 

 increasing in size and distance from one another posteriorly, steep 

 on the sides, and themselves delicately concentrically striated. 



Obs. — Edmondia ? Smithii was figured l3y an oversight with- 

 out name or description. The nature of the hinge is not appa- 

 rent, but the general outline reminds us of Edmondia, such forms 

 for instance as E. sculpta, De Koninck,* or E. scalariformis, De 

 Koninck.f The hinge line in the present specimen, however, is 

 proportionately shorter, and the posterior ventral end more pro- 

 duced. 



Zoc— Rockhampton District (^C. W. De Vis, Colin. De Vis, 

 Brisl:»ane). Gympie Series. 



Class — Gasteropoda. 



Order-PROSOBRANCHIATA. 



Family— PLEUROTOMARIID^. 



Genus — P t v c ii o m p ii a l i n a, Bayle, 1885. 



Ptychomphalixa Randsi, spnov. 



(PI. xLi. figs. 4 and 5.) 



Sp. Char. — Shell large, turbinate-conical, of four whorls, rapidly 

 increasing in size, so much so that the second and third are quite 

 disproportionate. Whorls convex, the two first less so than the 

 thii'd and last ; both the latter are deep and massive, and either 

 flattened or slightly concave below the suture, forming a kind of 

 shoulder ; apex slightly depressed ; base gently convex. Inner 



* Faiine Calc. Carb. Belgique, Pt. 5 (Ann. Mus. IL Hist. Nat. Belgiqut, 

 XI), t. 11, f. 45. 



t Ibid., t. 11, f. 40. 



