THE MARYLAND CYC ADS. 411 



graph, at the end of the book, of three cycads, a large one in the center and a 

 small one on each side of it. This was evidently taken by Mr. Tyson and 

 sent to Mr. Meek. The large central figure is a view of the opposite side 

 of the trunk last mentioned, turned considerably more to the left than it 

 was in the view given in pi. clxxix of Professor Fontaine's monograph, so as 

 not to show the peculiar broad line that runs down one side. The figure on 

 the left is a view of the Johns Hopkins fragment No. 3, also representing 

 C. marylandica. (See p. 457.) The figure on the right shows the Johns 

 Hopkins fragment No. 4, belonging to C. Bibbinsi. This view is 

 reproduced on PL LXXXIII of this paper. 



The third case referred to as doubtful is that of a considerable frag- 

 ment having every appearance of being a Maryland cycad, found by Prof. 

 L. C. Glenn, in the department of geology of South Carolina College, at 

 Columbia, in 1899, and of the existence of which he was so considerate as to 

 notify me. I expressed a great interest to see it, and he sent it on to Wash- 

 ington. He said there was no label whatever nor any indication of its 

 history or source, and we are therefore still left in mystery and can only 

 conjecture what its presence there might mean. The only hypothesis I 

 have been able to make is that Mr. Tyson sent the specimen to some one 

 of his correspondents who was at Columbia at the time he collected the 

 cycads. It proves to belong to Cycadeoidea Fontaineana, and is fully 

 treated in this paper. (See PI. LXXXVI.) 



Since the publication of my paper in 1897, describing the 7 species of 

 Maryland cycads, Mr. Bibbins had, by the end of 1901, obtained possession 

 of 37 additional trunks or fragments, and in January, 1901, at his request, I 

 visited the Woman's College and elaborated all this new material. The 

 collection, however, contained two well-marked new species and several 

 good specimens of species only sparingly represented in previous collec- 

 tions, and fragments referable to one or other of the species already 

 described. 



STRATIGRAPHICAL POSITION AND GENERAL NATURE OF THE MARYLAND CYCADS. 



By Akthuk Bibbins. 



The trunks of Cycadeoidea thus far yielded by the Potomac group," 

 about 112 in number, appear to have been derived from within the State 



« The author, following the nomenclature of the Maryland Geological Survey, treats the Potomac as a 

 "group " and designates its subdivisions " formations." — L. F. W. 



