3IO NEW YORK STATE MUSEUM 



and length of about 50 mm. This is from a bituminous layer of the 

 Genesee, at Iron Bridge Mills, Cayuga creek, Erie co. 



3 An oblique ovate shell of intermediate proportions and finer ribs, 40 

 to 45 in number, crossed by faint concentric striae. Valves of this species 

 have a length and hight of 30 mm. These have been found in the Genesee 

 shales just above the Styliola limestone, Seneca point, Canandaigua lake. 



conocardium Bronn. 1835 

 Conocardium gowandense sp. nov. 



Plate 12, fig. 35, 36 



This only species of the genus Conocardium in the Intumescens fauna, 

 is represented by but a single specimen, the right valve. This however 

 retains the form and surface characters sufficiently to justify description. 



Shell small, elongate triangular, posterior extension relatively long and 

 quite gradually tapering. Anterior extremity abruptly concave, delimited 

 by a broad crested plication which has an oblique direction from the beak 

 downward. Hinge line nearly straight in front of the beak. 



The body or medial portion of the valve bears three stout flattened 

 ribs, excluding the anterior one, and in the first intervening space are one 

 or two lesser ones with intercalated fine radial lines. Over the posterior 

 extension of the valve the ribs are simple, stout, not flattened, and of sub- 

 equal size. A very fine concentric striation of elevated lines covers both 

 plications and grooves, and is specially developed on the grooves of the 

 median portion of the shell. With considerable enlargement exceedingly 

 fine radial lines may be seen on the upper surface of the flat plications. 



The dimensions of the valve are : greatest length 16 mm ; hight, 9 mm ; 

 length on anterior carina 10 mm. 



Habitat. Genesee province ; Chautauqua subprovince. From the 

 arenaceous slabs at Gowanda, Cattaraugus co. 



