234 Systematic Paleontology — Middle Devonian 



jSTucdlites grabaui n. sp. 

 Plate XXVI, Fig. 6 



Description. — Shell rather less than medium size, cuneiform, widest 

 along line extending from beak to basal margin, pointed posteriorly; 

 length considerably less than twice the height; anterior end of shell 

 rounded, basal margin and cardinal line of posterior part of shell strongly 

 inclined toward each other so that the posterior half of the shell is de- 

 cidedly pointed. Valve depressed-convex in the lower and posterior por- 

 tions and only moderately convex in the umbonal region ; beak subcentral, 

 six mm. from the anterior and nine mm. from the posterior extremity; 

 just anterior to the beak is a broad and prominent clavicular ridge which 

 extends two-thirds of the distance across the shell, curving slightly toward 

 the anterior end. 



The above description was based upon a single internal impression of a 

 right valve from McCoys Ferry and consequently nothing is known regard- 

 ing the surface markings of the species. Its more nearly central beak and 

 pointed posterior end separate it from N. oblongatus; while its flatness, 

 lack of angular umbonal ridge and more central beak distinguish it from 

 N. cuneiformis. The writer hesitated to describe this specimen as a new 

 species therefore consulted Dr. Cfrabau who wrote as follows : " Why not 

 a new species? Its beak is too central to agree with N. oblongatus and of 

 course you have not much more to go on. Still I think you are safe in 

 giving it a new specific name." In view of the above statement it is 

 described as a new species and named in honor of Dr. Grabau. Later, 

 additional specimens were found southwest of McCoys Ferry. 



Length, 16 mm.; height, 9| mm. 



Occurrence. — Romney Formation, Hamilton Member. McCoys 

 Ferry ; southwest of McCoys Ferry. 



Collection. — Maryland Geological Survey. 



NucuLiTES modulatus Kindle 

 Plate XXVI, Figs. 7, 8 



Nuculites modulatus Kindle, 1912, Bull. U. S. Geol. Surv., No. 508, p. 89, pi. 

 vii, figs. 13, 14. 



