0(30 MESOZOIC FLORAS OF UNITED STATES. 



Celastrophtllum obovatum Fontaine." 



PI. CXVII, Figs. 2, 3. 



Celastrophyllum ohovatum was described in Monograph XV as com- 

 ing from Belt and Covington streets, Baltimore, and was noted as one 

 of the common dicotjdedons there. It has not been found in the Poto- 

 mac outside of Maiyland. Seventeen specimens occur in the later 

 collections from Federal Hill, some of them quite well preserved. PL 

 CXVII, Fig. 2, gives a nearly complete leaf of the smaller size. This 

 belongs to collection No. 8 and bears the number M. G. S., 8569. One 

 of the specimens in collection No. 6 shows very well the middle and 

 terminal portion of a leaf, and for this reason it is given in PI. CXVII, 

 Fig. 3. It gives the nervation also with unusual distinctness. It is 

 W. C, B., No. 6099. 



Nageiopsis angustifolia Fontaine. 



PI. CXVII, Figs. 4, 5. 



1889. Nageiopsis angustifolia Font.: Potomac Flora (Monogr. U. S. Geol. Surv., Vol. 

 XV), p. 202, pi. Ixxxvi, figs. S, 9; pi. Lxxxvii, figs. 2, 2a, 3-5, 5a, 6, 6a; pi. 

 Ixxxviii, figs. 1, 3, 4, 6-8; pi. Ixxxix, figs. 2, 2a. 



A fine specimen of the fossil first described in the Lower Potomac 

 flora of Virginia as Nageiopsis angustifolia, which is one of the most 

 widely distributed plants of the formation, was obtained b}' Professor 

 Uhler at Federal Hill, Baltimore, collection No. 3, from the lowest 

 horizon shown there, which is below that of the beds carrying Acros- 

 tichopteris longipennis. It is shown in PL CXVII, Figs. 4 and 5. This 

 horizon at Baltimore, so far as is known to me, has A'ielded very few 

 plants, hence this fossil is of unusual importance. Unfortunately, its 

 range, which is throughout the Lower Potomac formation, impairs its 

 value for fixing precise horizons. The specimen now in question shows 

 on one side of the rock fragment three considerable portions of ulti- 

 mate twigs having many leaves, some entire. One twig shows a por- 

 tion near its termination (see Fig. 5). The opposite side of the rock 

 has the end of an ultimate twig with a numJDer of well-preserved entire 

 leaves .(see Fig. 4). The exact locality for this specimen is Jackson 



" See p. 550. 



