Maryland Geological Survey 245 



shaj^e, position of beak and groat convexity in the nmbonal region ap- 

 parently separate it from other species. Later, additional specimens were 

 found at other localities. 



Length, 24 mm.; height, 16 mm. 



Named in honor of the late Dr. E. B. Rowe whose field work con- 

 tributed greatly to the exact knowledge of the Maryland Paleozoic. 



Occurrence. — Eomney Formation, Hamilton Member. McCoys 

 Ferry; on National Road \ mile west of Tonoloway Ridge; on Hancock- 

 Harrisonville Road about 2 miles north of Hancock. 



Collection. — Maryland Geological Survey. 



Palaeoneilo marylandica n. sp. 

 Plate XXVII, Fig. 16 



Description. — Shell medium size and extremely elongated; length more 

 than twice the height; basal margin convex below the umbonal slope, 

 rounded toward the anterior end and gradually tapering toward the pos- 

 terior extremity. Right valve convex especially along the umbonal 

 slope, anterior end rounded, posterior part tapering to almost a point 

 and crossed by a very slight depression ; beaks well anterior ; left valve of 

 specimen distorted and broken. Surface apparently marked by fine, con- 

 centric striae and occasional stronger ones, especially toward the margin. 



This specimen is much more elongate than any species of Palaeoneilo 

 with which the writer is acquainted, a form that is not considered due to 

 distortion by pressure. 



Length, 35 mm.; height, about 15 mm. 



Occurrence. — Romney Formation, Hamilton Member. On Han- 

 cock-Harrisonville Road about 2 miles north of Hancock. 



Collection. — Maryland Geological Survey. 



Genus TANCREDIOPSIS Beushausen 



Tancrediopsis clarkei n. sp. 



Plate XXVIII, Figs. 1, 2 



Desa'iption. — Shell above medium size ; length more than twice the 

 height, beak posterior to the middle and conspicuous; portion of shell 



