Species of Cycadeoidea from Maryland. 15 



around the trunk, one of these sets of rows ascending at an angle of 45 

 to the axis, the other at a much greater angle ; subtriangular, the upper 

 side arched and sometimes slightly grooved, lateral angles acute, inferior 

 angle obtuse or rounded; scars uniform in size, 18 millimeters wide and 

 9 millimeters high ; ramentum walls 4 to 5 millimeters thick, commissure 

 distinct, the whole punctured with minute rhombic, triangular, or ellip 

 tical bract scars, deeply penetrating the structures ; leaf bases usually 

 wanting, but sometimes nearly filling the cavities ; vascular bundles few, 

 arranged in a row near the upper side of the petiole and others scattered 

 over other parts; petioles all reflexed or pointing downward at a strong 

 angle; reproductive organs numerous, situated directly over the leaf 

 scars, i. e., axillary, ellipical in outline, 15 millimeters wide, 10 milli 

 meters high, the center occupied by the remains of the essential organs 

 or by a circular cavity where these have disappeared ; bract scars small 

 and numerous, somewhat curved and arranged concentrically around the 

 spadix, also passing out into the ramentum walls ; armor 3 to 5 centi 

 meters thick ; woody zone 15 to 35 millimeters thick, divided into two 

 or three rings ; medulla about 5 centimeters in diameter, cylindrical or 

 elliptical according to the shape of the trunk, heterogeneous in composi 

 tion, being traversed by dike-like plates of a hard substance dividing it 

 into chambers, often wanting, leaving a hollow cente'r to the trunk. 



Only two specimens are referable to this species, both of which agree 

 almost exactly and show the distinct specific characters which so clearly 

 separate it from all the others. The most perfect of these specimens was 

 kindly sent me by Professor Uhler for comparison with the one in Mr. 

 Bibbins' collection, which bears the number 1429 of the Museum of the 

 Woman's College. This latter is a fragment freshly broken from a larger 

 piece, which has not yet been recovered, although considerable is known 

 of its history. It must have been taller than the perfect trunk and per 

 haps more cylindrical in shape. The other and almost complete conical 

 trunk also has a history which I have not as yet sufficient data to record, 

 but this much seems clear, that both these specimens were originally 

 found at nearly the same spot. 



No one has taken greater interest in the fossil cycads of Maryland than 

 Professor P. R. Uhler, so long president of the Maryland Academy of 

 Sciences and now Provost of the Peabody Institute of Baltimore, and it 

 is fitting that this species should bear his name. 



Cycadeoidea Bibbinsi n. sp. 



Trunks large, 40 to 60 centimeters high, laterally compressed, girth of 

 largest specimen 1 meter, of next in size 88 centimeters, shorter axis 

 of cross section one half to two thirds of longer axis, contracted to 

 ward the summit, terminating in a conical bud 30 centimeters high, or, 

 where this is wanting, in a concave depression, thoroughly silicified 

 throughout, heavy and solid, of a dark color ; all the organs of the armor 

 nearly at right angles to the axis of the trunk ; leaf scars arranged 

 spirally around the trunk in imperfect quincuncial order, subrhombic, 



