265 
resembling tbe cbaracteristic 'British species JS. Sowerlii, McCoy, sp. One specimen 
showed the concentric close ornament, and seems to be the valve with the conate ears ; 
another displays the interior of the flat-eared valve (PI. 14, fig. 10), and, above all points, 
the typical central cartilage pit, the sockets for the obliquely diverging ridges, and the 
long posterior lateral grooves ; and there is a trace of the large eccentric adductor 
muscnlar impression. 
These Corner Creek specimens are small, but bear no comparison with the 
-B. Sowerlii ; it is therefore, probably, a distinct and smaller species, but the material 
is not copious enough to permit of a satisfactory determination. 
Zoo. and Horizon, Corner Creek, Great Star Eiver (i?. L. Jach ) — Star Beds. 
aenus—EUGHONDBIA, Meek, 1874. 
(American Journ. Sci., 1874, vii,, pp. 445 and 488.) 
Ohs. In this genus of Pectenoid shells, the hinge structure is peculiar. There 
IS a “comparatively large, oblique, central cartilage pit, and a row of smaller ones crossing 
the area at right angles all along, both before and behind the large oblique central pit.” 
The above are the late Professor P. B. Meek’s remarks in establishing his genus 
for the little Pecten negleatns, Geinitz, from Illinois. He believed Euchondria to be 
more nearly allied to Pernopeelen, AV^inchell,* * * § than to Aviculopeoten, but differs from 
the former in the obliquity of the central cartilage pit, and the presence of the true 
cartilage pits along the hinge. The so-called cartilage pits along the hinge of 
Pernojjecten are probably only interlocking crenulations of the hinge, and not receptacles 
for any portion of the ligament. 
Amongst the many indistinct fossils from the Corner Creek Beds, was a small 
semicircular shell with close, fine, concentric strife, a very rounded ventral margin, a 
long hinge-line, and a small anterior ear with radiating ridges. Along the latter are 
faintly visible tbe impressions of a vertical series of hinge- pits resembling those of 
^iichondria. No central oblique pit was observed, however, and since the specimen has 
passed from my hands, it has struck me that the genus Grenipecten, Ilall.t might put 
m as good a claim for it as Euchondria. In Hall's genus the “ hinge is furnished 
'^ith a series of small cartilage pits throughout its entire length”; and it would not 
surprise me to find that the impression under discussion is more properly referable 
to this than to the genus to which I assigned it in the list originally forwarded to my 
Colleague. J 
Loc. and Horizon. Corner Creek, Great Star Eiver {B. L. Jack ) — Star Beds. 
Family— AVICHL0PECTINID7E.§ 
Genus -AVIOULOPEOTEJSr, McGoy, 1851. 
(Ann. and Mag. Nat. Hist., 1851, vii., p. 171.) 
Ohs. In the Corner Creek Beds, three species of Aviculopecten have been 
Noticed. In the first species the hinge-line is long, the surface covered with fine 
fudiating costs, and the anterior ear very pronounced, narrow, long, and triangular, with 
* As a matter of fact it is more nearly allied to Grenipecten, Hall, 
p Prelim. Notice Lamellib. Sheila, Hp. Helderberg, Hamilton and Chemung Groups, Pt. 1, 1884, 
+ Handbook Queensland Geol., 188G, p. 39. 
§ Meek and Hayden, Pal. Up. Missouri, 1865, Pt. i., p. 49 
