MARYLAND GEOLOGICAL SURVEY 233 



Family DRUPACEAE. 



Genus PRUNUS l.inne. 

 PRUNUS ? MERRIAMI KnowltoiL 



Plate LXXII, Fig. 2. 



Prunus ? merriami Knowlton, 1902, Bull. U. S. Geol. Survey, No. 204, p. 

 67, pi. xi, figs. 2, 3, 6, 7. 



Description. — There can be no question as to the identity of the Mary- 

 land specimen with those figured by Knowlton, but the reference to the 

 genus Prunus is more than questionable. It is most likely a Hicoria. 

 In fact his P. tufacea (1. c. pi. xi, fig. 4) might well be united with it 

 under one species, as representing the lower leaflets, and his Rhus (?) 

 sp. (1. c. pi. xiv, fig. 6) as representing a terminal one. The identifica- 

 tion of the specimens, however, is of more importance from the standpoint 

 of stratigraphy than is the correct determination of their botanical 

 affinities. 



Occurrence. — Sunderland Formation. Near the headwaters of Is- 

 land Creek, Calvert County. 



Collections. — Maryland Geological Survey. 



Genus CASSIA Linne. 



Cassia sp. ? 

 Plate LXXI, Fig. 20. 



Description. — This single small leaflet is hardly sufficient upon which 

 to base a description of a new species or for making satisfactory compari- 

 sons. It is apparently slightly inequilateral at the base and has some 

 resemblance to C. ambigua ITng. (Gen. et Sp. PL Foss., p. 492; Syll. 

 PL Foss., vol. ii, pi. x, fig. 9) and to Legumvnosites salicinus Heer (Fl. 

 Tert. Helvet. vol. iii, p. 128, pi. cxxxix, figs. 28-30), but as the nerva- 

 tion is not apparent it has been thought best not to refer it even provis- 

 ionally to either of the above species. 



Occurrence. — Sunderland Formation. Near the headwaters of Is- 

 land Creek, Calvert County. 



Collections. — Maryland Geological Survey. 



