OLDKK rUTU.MAC C)i' \lR(iiMA AM) .MAKVl.AM). 565 



tlieii' insertions on iho midi'i!). The tci'tiaiy nei-\';it ion cnii not he dis- 

 tinctly seen. 



The specimen on wiiicli lliis imprint occurs constitutes collection 

 Xo. 2. The rock matter carrying the plant is identical with that fiom 

 Jackson sli-eet, which contains .Ir/vw/Zr/zf^/Vr/'/x Idiifilpciuiis, and no doubt 

 the sti'atum yieldiiifi both the species is the same. 



This species is named for its tliscoverer, Pi'of. P. 1{. ('1i1(M'. The 

 specimen is deposited in the National Museum. 



TiiYR.sopTEKis Meeki.w A Fontaine. 



PI. CXIX, iMK. 1. 



ISSO. Thyrsoptfris Meel:i(in<i Fonl.: Potomac Flora (Monoi^r. V . S. (icol. Siirv. 

 Vol. XV), p. 125, pi. .x.wviii, figs. 2, 2a, 2b. H. .Ui, 4. 4a, S; p|. 1. lijrs. 7, 

 7a, S; pi. ji, figs. ;^, .Sa. 



This species is shown in one good specimen from the Terra Cotta 

 Works, collection No. 6. It is described in Monograph XV as one of the 

 most abundant plants collected by Professor Meek at an unknown 

 locality in Baltimore. This specimen, shown in PI. CXIX, Fig. 1, is the 

 terminal part of a penultimate pinna with a good many ultimate ones 

 bearing pinnules. It gives a part of the fern not shown in any of the 

 specimens figured in Monograph XV. This fossil shows that in the 

 fern, toward the summit of the compound pinna', the pinnules lose their 

 lobing and become entire, passing finally into teetli, while the ultimate 

 pinna; become dentate pinnules. The upper portions of the pinnules, 

 after the loss of their lobing, look somewhat like a small Cladophlebis. 

 This species, while it is most abundant in the Baltimore sti-ata, is found 

 also in the beds of the Rappahannock hoi-izon of \'irginia. The specimen 

 l)ears the number 5358 of the museum of the Woman's College of Balti- 

 more. 



ViTiPHYLLUM MULTiFiDUM Fontalne." 



PI. CXIX, Figs. 2-4. 



Vitiphyllum muUiiidum was first described in Monograph XV from 

 Belt and Covington streets, Baltimore. It is much the most common 

 plant in the recent collertions from Federal Hill, which contain no fewer 



« See p. 553. 



