74 Bulletin 1, Biological Society of Washington, 1918. 



Fishes ascending river to Great Falls. 

 Alosa sapidissima Morone americana 



Roccus lineatus 



Fishes occurring only in the Piedmont. 

 Salvelinus fontinalis Cottus meridionalis 



Percopsis omiscomaycus 



BIBLIOGRAPHY. 



Darton, N. H., and Keith, Arthur. 



Description of the Washington Quadrangles. Geologic atlas of the 

 United States. Washington Folio. 1901. pp. 1-7. 



Miller, B. L., Bonsteel, J. A., Alexander, W. H., Newell, F. H., 

 Bauer, L. A., and Besley, F. W. 



Maryland Geological Survey. Prince George's County. 1911. 251 

 pp., 13 pis., 3 figs. Topographical and geological maps in separate 

 cover. 



Contains an extensive bibliography, pp. 33-68, many of the cita- 

 tions in which relate to the coastal plain. 



Clark, W. B., and Miller, B. L. 



The Physiography and Geology of the Coastal Plain Province of 

 Virginia, with chapters on The Lower Cretaceous, by E. W. Berry, 

 and The Economic Geology, by T. L. Watson. Bui. No. IV, Virginia 

 Geological Survey, 1912, 274 pp., 19 pis., 1 fig., geological map. 



Like the preceding this publication contains a valuable bibliog- 

 raphy, pp. 19-45. 



MAGNOLIA BOGS NEAR WASHINGTON, D. C., AND 

 THEIR RELATION TO THE PINE BARRENS. 



In treating the types of collecting grounds in the District 

 of Columbia region, a task to which this chapter and the next 

 are devoted, it is easiest to begin with an account of the 

 most strikingly characterized areas. In the writer's opinion 

 this distinction clearly belongs in this region to the white 

 sand and gravel bogs, or magnolia bogs, found only in the 

 Coastal Plain formations. 



The name Magnolia Bogs is selected for the areas about 

 to be discussed, because it has a certain currency, and be- 

 cause the swamp magnolia or sweet bay (Magnolia vir- 



