546 Systematic Paleontology — IJprER Devonian 



or slightly rouDcled pits, Mhicli commonly alternate in position. The 

 median ridge dividing the two grooves is not straight but is crenulated 

 by slight inflections directed toward the transverse ridges. Length and 

 width of pits siibequal. The impressions usually become faint toward 

 their ends and are often ciii'vcd. 



Width of track about 4 mm., diameter of pits about 2 mm. Tracks 

 are several centimeters long. Similar tracks are abundant in the beds 

 containing the Naples fauna in New York. 



Occurrence. — Jennings Formation, Woodmont Member, Naples 

 Fauna. Tonoloway. 



Collection. — Maryland Geological Survey. 



MOLLUSCOIDEA 



Class BRACHIOPODA 



Order ATREMATA 



Superfamily LINGULACEA 



Family LINGULIDAE 



Genus LINGULA Bruguiere 

 LiNGULA OHERNI n. sp. 

 Plate XLVII, Figs. 1-5 



Description. — Shell ovate-elliptical, slightly convex; width two-thirds 

 to three-fourths length, greatest width slightly anterior to middle of 

 valve. Cardinal slopes rounded, sides diverging slightly to a point in 

 front of middle, anterior margin rounded. The shape of the cardinal 

 margin is variable, in some cases forming an acute angle or in others 

 being truncate. Surface marked by fine concentric striae. A fine im- 

 pressed line extends from center of umbo a part of the length of the 

 valve in some individuals. Slicll substance thin. 



Length of larger individuals 8 to 12 mm. ; width 6 to 9 mm. 



This species resembles L. delia of the Hamilton of New York, but is 

 smaller, proportionally wider, its cardinal slopes not abrupt. It differs 



