1872.] ETHERIDGE — QUEENSLAND FOSSILS. 327 



it to the above species. Shell inequilateral or oblique, slightly con- 

 vex near the umboual region or beak ; the ribs are also irregular 

 and wavy, about 35 in number, and all meet near the umbo ; lines 

 of growth obscurely wrinkled ; ears small, radiated, and coarsely 

 wrinkled. Prof. Morris does not state the dimensions of his shell ; 

 proportionately our single specimen agrees with his, but apparently 

 is individually larger. 



I insert the original description by Prof. Morris : — " Shell subor- 

 bicular insequilateral, most convex towards the beak ; rays numerous, 

 irregular, approximate near the beak ; ears rather small, wrinkled. 

 Loc. Eastern Marshes, Van Diemen's Land." 



IjOC. Gympie. Form. Devonian. 



AvicuLOPECTEii ? iMBEicATtrs, Ether. Plate XIY. fig. 2. 



An impression only, and that of the inner surface, of one valve of 

 this singular and doubtful shell occurs. Our figure is taken from 

 a gutta-percha cast of the impression left; and its peculiarity induces 

 me to figure and notice it, in the hope of receiving perfect specimens. 

 That it belongs to the Asiphonida I do not doubt, and, I believe, to one 

 of the Aviculidse. The umbonal region is certainly not complete ; and 

 therefore no true conclusion can be arrived at relative to the nature 

 of the ears and hinge-line of the perfect shell. 



Shell inequilateral, and possessing twenty -two ribs, the ends or 

 extremities of which imbricate or overlap in the cast ; there appears 

 to be, or to have been, a space between the end of each rib at its 

 extremity, or along the ventral margin ; faint longitudinal markings 

 run down each of the ribs, following their course. Many of our 

 Limce possess bent and folded ribs (Ex. L. rustica) ; but their pecu- 

 liar arrangement in our shell is difi'erent from that in any known 

 Lima. 



Loc. Gympie. Form. Devonian. 



AvrcTJLOPECTEN MULTiKADiATTjs, Ether. Plate XIII. fig. 1. 



Shell nearly equilateral, orbicular, depressed, slightly convex, with 

 about sixty well-defined equidistant sharp ribs, all meeting at the 

 umbo ; these ribs appear to have been sharply elevated and plain ; 

 ears not seen ; lines of growth well defined. 



Figure reduced one fourth. 



Loc. Gympie. Form. Devonian. 



Ohs. This shell resembles Av. planoradiatus, M'Coy, both in form 

 and in the nature of the ribs ; our shell, however, has the edges of 

 the ribs sharp, instead of being flattened, and is not so convex a 

 shell as A. planoradiatus. It has also afiinity with Pecten squa- 

 muliferus, Morris, from Mount Wellington, Van Diemen's Land*; 

 I cannot, however, clearly determine the presence of imbricated 

 scales upon the ribs ; and unfortunately we have no " ears" left to 

 correlate with Prof. Morris's species : it may also be compared with 

 the Aviculopecten docens, M'Coy, Brit. Pal. Foss. t. 3. figs. 6 «& 7. Our 

 shell also possesses about the same number of ribs,. 



* Strzelecki, Phys. Desc. N. S. Wales and Van Diemen's Land, p. 278, t. 14, f. 1. 



