616 Systematic Paleoxtology — Upper Devonian 



and flat, their upper surfaces bearing concentric, retrally curved but not 

 angulated strise, all of which are fine, small and of uniform size. The 

 interspaces between the ribs also show such concentric stria^ on the lateral 

 slopes of the valves but these are very much finer than on the ribs, and 

 over the median parts of the shell cannot be discerned. The distinction 

 from B. livonice, described below is found in the prominence of the ribs 

 and the distinct concentric ornamentation as well as somewhat also in 

 the form of the shell. 



Length 5 mm. ; height 3 mm. 



Occurrence. — Jennings Formation, Genesee Meaiber. This form 

 of Buchiola is not common having been found only in the shales on the 

 Williams Eoad 1,0 mile east of the Queen City Hotel, Cumberland, and 

 no precisely similar expression has yet been observed in the Intiimescens 

 fauna of New York or Europe. 



Collection. — Maryland Geological Survey. 



Buchiola ( ?) livoniae Clarke 

 Plate LX, Figs. 9-12 



Buchiola livoniw Clarke, 1904, N. Y. State Mus., Mem. vi, p. 299, pi. xi, 

 figs. 1, 2. 



Description. — Shell of rather large size and transversely ovate with 

 the greatest vertical diameter posteriorly. It is specially distinguished by 

 the character of its surface which is marked by about 20 very low flat 

 ribs having nearly twice the width of the spaces between them. The 

 sides of the ribs are erect though very low and so obscurely are they 

 developed that sometimes it is difficult to trace them on the anterior slope 

 of the valves. In every case, however, the first or three short ribs be- 

 neath the beak on the anterior moiety of the hinge are strong elevated 

 and rounder than the rest. Extremely fine concentric lines cover both 

 ribs and furrows but this ornamentation can only be seen by favorable 

 illumination. 



Length 7 mm. ; height 5 mm. 



Buchiola livonice was first found in the Styliola limestone (Genesee 

 shale) of the great salt shaft put down at Livonia, New York, and it 



