Species of Cj/cadcohlca froDi Man/la nd. 15 



around the trunk, one of these sets of rows ascending at an an<:le of 45° 

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

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

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

 9 millimeters high ; ramentum walls 4 to -"i millimeters thick, commissure 

 distinct, the whole punctured with minute rhombic, ti'iangular. or ellij>- 

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

 wanting, but sometimes nearly tilling 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 oi'gans 

 or by a circular cavity where these have disappeared; l)ract 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 zolie 15 to 35 millimeters tliick, 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 center to the trunk. 



Only two specimens are refei'able 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 w'as 

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

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

 Woman's College. Tliis latter is a fragment freshly broken fi-om 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 sliape. Tlie other and almost complete conical 

 trunk also has a history wdiicb 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 

 nearh' at right angles to the axis of tlie trunk ; leaf scars arranged 

 spirally around the trunk in imperfect quincuncial order, subrhoml)ic, 



