species of f'l/radcoidca from 3Ian/Ioii(f. 11 



him should stand at the head. 1 sliall refer to it as No. 1 of the speci- 

 mens at tlie Johns Hopkins University, although Professor Fontaine 

 calls it No. 2. It is the largest and most perfect of the trunks belonging 

 to this species. The other nearly perfect trunk of the original lot, which 

 Professor Fontaine calls No. 1, will be referred to as "Johns Hopkins 

 Cycads No. 2." The other two specimens described by Professor Fon- 

 taine were fragments, and were called by him "fragment No. 1 " and 

 "fragment No. 2." The first of these belongs to another species, as will 

 be seen below. His " fragment No. 2" probably belongs to this species, 

 but is somewhat anomalous. It will be referred to as " Johns Hopkins 

 Cycads No. 3." A few years ago Professor Clark informed me that an- 

 other specimen had been found about the University buildings, but he 

 could give no further account of it. With his permission I have exam- 

 ined and described it and have had photographs made not only of this, 

 but also of the other two fragments, which had not hitherto been illus- 

 trated. The newly found specimen, although not an entire trunk, is 

 much more complete than either of the other fragments. It clearly be- 

 longs to this specie.s, and will be referred to as " Johns Hopkins Cycads 

 No. 5." The largest specimen in the Museum of the Maryland Academy 

 of Sciences also belongs to this species, although it has suffered murh 

 from wear and many of the characters are obscured. It will be referred 

 to as "Maryland Academy Cycads No. 1." The remaining thirteen 

 specimens belong to the Woman's College and embrace the following 

 numbers of the museum of that college: 1192, 1428, 1481, 1480, 1656, 

 1657,3050, 3051, 3056, 3057, 3324, 3328, 3341. Many of these are fine 

 specimens, consisting of nearly complete trunks, and of the specific 

 identity of such there is no doubt, but there are several small and im- 

 perfect fragments, which scarcely show characters enough to render their 

 specific assignment safe. In these and all similar cases I reserve the 

 right to alter the assignment in case further study or future (liscoverj' 

 shall seem to require it. The most important of these sj^ecimens is No. 

 1481, because, besides being a nearly perfect trunk, showing all the typ- 

 ical characters, it is the only one of Mr. Bibbins' specimens whose exact 

 stratigraphical position is definitely determined. 



Cycadeoidea Tysoniana n. sp. 



Trunk medium sized or large, more or less compressed laterally ; leaves 

 slightly ascending; leaf scars arranged in spiral rows, 9 millimeters high, 

 22 millimeters wide, subrhombic, empty to some depth, petioles persistent 

 at base, the vascular bundles arranged in one row near the exterior and 

 a group near the center, often persisting after the decay of the remaining 

 substance; ramentum walls thin, often with a layer of spongy substance 

 in the middle, wrinkled on the edges ; reproductive organs few and small ; 

 armor 5 centimeters thick ; libro-cambium zone sometimes distinct. 3 

 millimeters thick; woody zone 6 to 8 centimeters thick, consisting of a 

 broad outer parenchymatous layer 4 to 6 centimeters thick, and a narrow 

 inner vascular zone 1 centimeter thick, the latter usually between open 



