330 SYSTEMATIC PALEONTOLOGY 



the turn into the ' vestibule ' the wall is merely sharply curved and not 

 angular, as in R. mutabilis." Ulrich, 1893. 



Occurrence. CHAMBERSBURG LIMESTONE (Echinospherites bed). 

 Southern Pennsylvania and Pinesburg Station, Maryland. Lower Tren- 

 ton of Kentucky, Tennessee, and Minnesota. 



Collections. Maryland Geological Survey, IT. S. National Museum. 



, . . BRACHIOPODA 



Order ATREMATA 



Family OBOLIDAE 



Genus LINGULELLA Saiter 



LlNGULELLA Sp. 



Description. No fossils have been found in the Waynesboro formation 

 in Maryland, but Stose records the discovery of a few poorly preserved 

 shells in the sandy shales at the top, just each of Waynesboro in Pennsyl- 

 vania. These were identified as an undetermined species of Lingulella 

 suggesting Middle Cambrian age. Better preserved material is necessary 

 before any stratigraphic use can be made of this species, and for that 

 reason it has not been figured. 



Occurrence. WAYNESBORO FORMATION. Just east of Waynesboro, 

 Pennsylvania. 



Collection. U. S. National Museum. 



Genus LEPTOBOLUS Hall 

 LEPTOBOLUS ? OVALIS n. sp. 



Plate XLIX, Figs. 14-16 



Description. This interesting little brachiopod is associated with the 

 quite similar Lingula riciniformis Hall from which it can be distin- 

 guished externally by its more rounded beak. Internally the valves of 

 this new Leptobolus show the two or three diverging, slightly elevated 

 septa characteristic of the genus, but these are so faintly developed that 



