554 MESOZOIC FLORAS OF UNITED STATES. 



outside of the Baltimore localities. Taken with the specimen of Celas- 

 trophyllum ohovatum, a noteworthy connecting link with the Baltimore 

 beds is given. The rock specimen, as stated, was collected by Mr. Bib- 

 bins in October, 1895, and is No. 6154 of the Woman's College museum. 



WiLLiAMSONiA ? BiBBiNSi Ward n. sp." 



PL CXV, Fig. 11. 



The probable Williamsonia depicted in PI. CXV, Fig. 11, shows a 

 portion of an apparent axis of inflorescence and the basal parts of what 

 seem to be a number of bracts surrounding it. It may be a cone of 

 Abietites compressed vertically so as to shorten the axis. It was col- 

 lected in October, 1895, and is W. C, B., No. 6087. 



The above account of the plants collected by Professor Ward and 

 Mr. Bibbins from the Vinegar Hill locahty justifies the opinion that the 

 age of the beds is that of the lower portion of the Lower Potomac as 

 found in Virginia — that is, that it corresponds to the Fredericksburg 

 strata, called in Professor Ward's subdivision the Rappahannock seiies. 

 There are no plants in the list that are opposed to this opinion. As the 

 Arundel group of the Maryland subdivision of the Lower Potomac, 

 judging from the plants credited to it on the labels, corresponds with 

 this Fredericksburg or Rappahannock member, the evidence of the plants 

 indicates clearly that the Vinegar Hill beds belong to that division. 



FOSSIL PLAXTS FKOM SO PEE HALL, 



[PI. LXXX, No. 61.] 



This locality is an old, abandoned system of iron mines, once exten- 

 sively worked and covering a large area in a bold prominence on the right 

 bank of the Patapsco, about 2 miles below Elkridge Landing and 1 mile below 

 the crossing of the Baltimore and Potomac Railroad at Patapsco station. 

 The determinable material obtained from this locality represents five 

 different collections, viz: 



1. In June, 1892, Messrs. Arthur Bibbins and H. H. Hindshaw collected 16 cones 

 for the Woman's College of Baltimore. 



2. Two specimens, one a cone, were collected by Mr. Bibbins for the same 

 institution in June, 1892. 



« Professor Fontaine left this form specifically unnamed. It was collected by Mr. Bibbins and may be 

 named for him. — L. F. W. 



