70 



SHORTEE COXTEIBUTIOXS TO GEXERAL GEOLOGY, 1910. 



The Calvert specios is named from its resem- 

 })lance to Bcrclumia prisca Saporta/ from the 

 AquitaniaTi of Peyriae, Franee, a very simih^r 

 but slightly mor(> oblong leaf. 



Occm-reneo: Ciotul Hope Hill, T). C. 



Order ERICALES. 



Family VACCINIACE^. 



Genus VACCINroM Liniie. 



Vaccinium cf. V. textuni Heer. 



Plate XII. ligm-es 14, 15. 



Several specimens of a small oval sub- 

 coriaceous leaf are indistinguishable from 

 Vaccinium textum Heer,^ from the Tortonian 

 of Oeningcn, Baden. Heer's description is 

 as follows: 



V. folius subroriaeeis, ovaUbus, integerriinis, apice 

 ol)tusiusculis, basi rotiindatis: nervis secundariis campto- 

 (Iruiuis, areis reticulatis. 



The Calvert form agrees with its European 

 contemporary in size, general outline, and 

 texture, as well as in secondary and tertiary 

 venation characters. The only difference is 

 the more acute base of the American form. 

 The latter feature and the wide geographic 

 separation of the two occurrences have pre- 

 vented the direct reference of the American 

 form to Pleer's species. 



' Saporta, G. de. Etudes sur la vi^getation du sudest de la France k 

 lV'i)oque tertiaire, vol. 2, p. 338, pi. 11, fig. 1, isijii. 

 ! Hcer, Oswald, op. cit., p. 190, pi. 153, figs. 40-12. 



The genus contains al)out 125 existing species 

 of wide geographic distribution, especially in 

 the temperate and boreal regions of the 

 Northern Hemisphere. It occurs, however, 

 at high elevations in the Tropics, both north 

 and south of the Equator, and evident!}' grew 

 in intermediate areas at some past times. 



The fossil species are numerous and ranged 

 from the Eocene onward, with their maximum 

 display during the Miocene, when they were 

 especially abundant in southern Europe along 

 the shores of the Mediterranean Sea of that 

 epoch. 



Occurrence: Good Hope Hill, D. C. 



Family EKICACEJE. 

 Genus PIERIS Don. 

 Pieris scrobiculata Hollick. 



Plate XII, figure Vi. 



Pieris scrohindata. Hollick, Miocene, p. 48(5, tf. Ig, Mary 

 land Geol. Survey, 1904. 



This species was described by Hollick from 

 material obtained at the Good Hope Hill 

 locality. He compared it with the existing 

 Pieris nitida (Bartram) Bentham and Hooker, 

 a shrub of wet woods which ranges from south- 

 eastern Virginia to Florida near the coast and 

 is said to occur also in Cuba. Additional ma- 

 terial from the type locality agrees with the 

 type in outline and texture, but is only 11 

 millimeters in length and 5 millimeters in 

 maximum width. 



Occurrence: Good Hope Hill, D. C 



