Notes on Cincinnatian Fossil Types 
337 
near the top of the hills, in Cincinnati, but the museum label bears 
the legend, “Warren Co., Ohio,’’ and the latter probably is the real 
origin. I know of no reason for regarding this type as of earlier age 
than the Waynesville member of the Richmond. 
The type so evidently is merely a flattened specimen of Phola- 
domorpha pholadiformis^ such as are characteristic of the soft clay 
shale deposits in the lower part of the Waynesville member of the 
Richmond, that it deserves no further comment. The figure pre- 
sented by Miller and Faber is sufficiently accurate, but another 
figure is offered in the present Bulletin. The so-called posterior 
wing, mentioned in the original description, is merely the postumbo- 
nal slope. The low, broad, transverse plications along the posterior 
part of the cardinal margin are sufficiently distinct to suggest those 
of Pholadomorpha divaricata, as figured from the Rivere des Hurons 
in this Bulletin, in 1914. 
44. Pholadomorpha sulcata, Miller and Faber 
{Plate V, Fig. 2) 
1892. Modiolopsis sulcata Miller and Faber, Jour. Cincinnati Soc. Nat. Hist.’ 
15, p. 79, Plate 1, Fig. k 
The type of Modiolopsis sulcata, numbered 8798, is preserved in 
the Faber collection at Chicago University. It was described as 
having been found on the hills at Cincinnati, Ohio; on the label, 
however, the words “Warren Co., Ohio” appear and the latter 
locality probably was the real origin. I know of no reason for re- 
garding its horizon as having been below that of the Waynesville 
member of the Richmond. 
It is so evident that the type is merely a vertically compressed 
specimen of Pholadomorpha pholadiformis that it is difficult to under- 
stand how the specimen came to be described at all. While the 
vertical diameter of the specimen has been diminished very much 
by compression, the cardinal view has not been altered greatly, so 
that from this point of view the flattened umbones, narrowly com- 
pressed, and the flattened cardinal slopes immediately posterior 
to the beaks are well exposed. The lanceolate widening of the shell 
toward midlength is well preserved. The radiating low broad 
grooves on the postumbonal slope, mentioned in the case of the 
interior cast of Modiolopsis capax, have been accentuated by the 
vertical compression, but the figure accompanying the original 
