10 Brachiopoda of the Cincinnati Group. 



Whore the shell is exfoliated from the anterior half of the clorgal 

 valve, lines are shown radiating from a depression, in the middle part 

 of the cast of the interior, which terminate before reaching half way 

 to the lateral margins ; and also two curving lines or depressions sit- 

 uated about half way from the middle to the lateral margins and 

 coming together in the middle, near the anterior margin. 



A groove marks the median line of the cast of the interior of the 

 smaller or ventral valve for more than half its length ; it commences 

 below the beak, at about the line of the first quarter, and terminates 

 within the last quarter. 



Found from 400 to 600 feet above low Avater-mark. The specimen 

 figured I found at Versailles, associated with Anomalodoiita gigantea, 

 about 300 feet below the Upper Silurian rocks. It is quite rare. 



The specific name is given in honor of Mr. W. C. Van Home, a 

 gentleman of no ordinary paleontological attainments, now a resident 

 of LaCrosse, Wisconsin, and General Manager of the Minnesota South- 

 ern Eailroad. 



lAnguIa Norwoodi — (James) . 



Fig. 2. — Linrjula Norwoodi. 



Shell elliptical in outline; regularly convex; surface marked by 

 concentric lines ; beak rather prominent. 



Length, about i'\ths inch; breadth, rVhs inch. 



Named in honor of Prof. J. G. Norwood, of Columbia College, 

 Missouri, formerly State Geologist of Illinois. 



This beautiful little species was found by Mr. U. P. James, near 

 Cincinnati. Rano'c unknown. 



Genus Leptobolus — (Hall, 1871). 



[Eti/in. — Minute and obulus.] 



Shell seml-phosphatic, fragile, minute, more or less elliptical, ovate 

 or subcircular, with moderately (or sometimes more extremely) convex 

 valves, which are concentrically marked on the exterior surfiice ; ven- 

 tral valve Avith a distinct . area and pedicle groove ; interior with an 

 elevated subquadrate muscular area; dorsal valve a little thickened 

 on the cardinal margin, with slightly elevated, trifid, muscular impres- 

 sions. 



