368 Systematic Paleontology 



compared with well-dried seeds of a modern Zamia the resemblance 

 is found to be very close. 



Occurrence. — Arundel Formation. Muirkirk, Prince George's 

 County. 



GoUection. — IT. S. National Museum. 



Cycadeospermum obovatum Fontaine 



Cycadeospermum o'bovatum Fontaine, 1890, Mon. U. S. Geol. Survey, vol. 



XV, 1889, p. 270, pi. cxxxv, fig. 13. 

 Cycadeospermum obovatum Fontaine, 1906, in "Ward, IMd., vol. xlviii, pp. 



485, 520, 528, 545, pi. cvii, fig. 5. 



Description. — Medium sized ovate-spatulate seed-like objects, 10 mm. 

 to 12 mm. in length, by 6 mm. to 9 mm. in greatest width which is 

 toward the obtusely rounded end; the opposite end is reduced to a 

 narrow pointed neck. Surface smooth and shining, hard. 



This species, which was basied upon the specimens from near Potomac 

 Run, Virginia, has been found at a number of additional localities in 

 Virginia and Maryland. Its reference to this genus is of doubtful 

 propriety and it is quite suggestive of the seeds of various modern mem- 

 bers of the TaxaceEE, so that the inference is raised whether it might not 

 be related to CepJialotaxopsis or Nageiopsis of the Potomac flora. 



Occurrence. — Arundel Formation. Langdon, District of Columbia; 

 Grerman's Iron Mine (?), Maryland. Patapsco Formation. Fort 

 Foote, Maryland. 



Collection. — U. S. JSTational Museum. 



Cycadeospermum acutum Fontaine 



Cycadeospermum acutum Fontaine, 1890, Mon. U. S. Geol. Survey, vol. xv, 



1889, p. 270, pi. cxxxv, fig. 12. 

 Cycadeospermum acutum Fontaine, 1906, in Ward, IMd., vol. xlviii, 1905, 



pp. 480, 535. 



Description. — Seed small, oval, obtusely rounded at one end and 

 markedly acute at the other, about 7 mm. in length by 6 mm. in greatest 

 breadth. Surface smooth and firm. 



