554 MESOZOIC FLORAS OF UNITED S'I'ATES. 



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

 trophi/Uum obovation, a noteworthy connecting link with the Baltimore 

 beds is given. The rock specimen, as stated, was collected by ]\Ir. Bil)- 

 bins in October, 1895, and is Xo. fil54 of the Woman's College museum. 



WiLLiAMSoxiA '. BiBBixsi Ward n. sp." 



PI. CXV, Fig. 11. 



The probable Williamsonia depicted in PL 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 locality 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 series. 

 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. 



FOSSII, PL.INTS FKOM SOPER IHLL. 



[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 thePatapsco, 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. Ai-thur 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, 1S92. 



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

 named for him. — L. F. W. 



