THE KIMMSWICK AND PLATTIN LIMESTONES 
215 
34. Bumastus rowleyi sp. nov. 
Plate XXI, figs, 16 A, B; plate XXII, figs. 16 A, B 
Cranidmm 19 mm. long, 21 mm. wide between the palpebral 
lobes, and 22 mm. wide at the broadest part anterior to the 
palpebral lobes. The general aspect of the cranidium resembles 
that of Bumastus ambiguus Foerste from the Brassfield lime- 
stone of Ohio and Indiana. The cast of the lower side of the 
cranidium shows impressed lunettes along the dorsal groove. 
These lunettes are separated by a distance of nearly 10 mm. 
from each other. They are 3 mm. long and are 4 mm. distant 
from the posterior margin of the cranidium. Both anterior and 
posterior to the lunettes the dorsal grooves curve strongly out- 
ward. Anterior to the lunettes the dorsal grooves are very 
faint and terminate in distinct pits at points 15.5 mm. from each 
other and 11 mm. from the posterior margin of the cranidium. 
Each pit contains a small central granule. The cranidium is 
moderately convex except toward the anterior margin where it 
curves rather abruptly downward. 
The associated pygidium is 22 mm. long, 27 mm. wide, and 
has an anterior elevation of 7 mm. The cast of the lower sur- 
face is moderately concave along the doublure, but the upper 
surface appears to have been slightly convex from the more 
convex middle parts of the pygidium as far as the posterior 
margin. 
Found at locality 3 in the Kimmswick limestone section along 
Sanders branch in Balls County. Compared wiih. Bumastus inde- 
terminatus Walcott, from the Leray-Black River of New York 
(Bull. Mus. Comparative Zoology, 60, 1916, pi. 2), Bumastus 
rowleyi has a longer, narrower cranidium with a different curva- 
ture along the anterior part of the dorsal grooves on the cranid- 
ium, and the general outline of the pygidium is more triangular, 
especially posteriorly. 
