Maryland GtEological Survey 343 



analysis, and it might be added that this was the view taken by HoUick ' 

 with reference to material from Glen Cove, Long Island, and by Vele- 

 novsky'' in studying the Cenomanian flora of Bolicmia. 



Forms indistinguishable from the type of this species occur in both 

 the Patuxent and Patapsco formations of the Potomac Group, as well 

 as in the Kootanie of Montana and British Columbia. As found in the 

 Maryland- Virginia area the pinnules are always detached, lanceolate in 

 outline, pointed at both ends and oddest toward the base. Length about 

 11 cm. ; greatest width about 12 mm. 



Occurrence. — Patuxent Formation. Telegraph Station (Lorton), 

 Tirginia. Patapsco Formation. Ft. Foote, Maryland; Mt. Vernon, 

 Virginia. 



Collection. — U. S. JSTational Museum. 



Genus ZAMITES Brongniart 

 [Prodrome, 1828, p. 94] 



The genus Zamites is strictly a form-genus for the reception of 

 cycadean fronds which resemble in a general way those of recent Zamias. 

 It has been used in a somewhat varying and rather vague sense by vari- 

 ous authors since its proposal by Brongniart in 1828. Proposed at a 

 time when but two types of modern cycad fronds, Cycas and Zamia, 

 were recognized, it shows some of the characteristics of the modern genera 

 Zamia, Macrozamia, C eratozamia, etc. Afterwards Brongniart ^ aban- 

 doned his older use of the genus Zamia Linne as indicative of too 

 definite a relation to the modem species which by that time had become 

 segregated into a variety of genera and recharacterized Zamites as fol- 

 lows : " Ce genre est caracterise par ses folioles parf aitement entieres, 

 non tronquees au sommet, mais aigues ou arrondies, non retrecies ou 

 legerement eontractees a la base; a nervures paralleles entre elles et au 



1 Hollick, Mon. U. S. Geol. Surv,, vol. 1, 1907, p. 35. 



2 Velenovsky, Gymn. Bohm. Kreidef., p. 11, pi. 11, figs. 11-19, 24, 1885. 

 ^ Brongniart, Tableau, 1849, p. 61. 



