![Trigonia costata](http://www.geoed.co.uk/cdn/shop/products/pictrilonew_3c92ea7a-7071-4c35-b02a-30c6c85b6bba_{width}x.png?v=1580635972)
Almost perfect, complete sample, with both valves showing different ornament, with smooth, even growth lines on the larger faces and much more irregular ornamenton the smaller, with a prominent ridge between.
Size: 34mm
Size: 34mm