L. F. Ward — Fossil Cycads in the Yale Museum. 337 



probably represent at least three different trunks. Nos. 620 

 and 623 are the bases of two different trunks. Nos. 627 and 

 630 fit together, and Nos. 629 and 631 probably belong to that 

 trunk. No. 610 is a small fragment clearly showing the same 

 characters, but not known to belong to any of the other speci- 

 mens. 



The only affinities shown by this species with any other are 

 with C. jStillwelli, and here the resemblance is confined chiefly 

 to one specimen, No. 105, yet the scars of that specimen are 

 not only larger but have more or less curving sides, and the 

 leaf bases are not so squarely truncated as in these forms. It 

 is also more strictly cylindrical. Further material may tend 

 to assimilate these specimens ; if so the effect will be to remove 

 that specimen from G. Stillwelli and enlarge the scope of 

 this species. 



The specific name relates to the exactly rhombic scars. On 

 Plate II a view of the fragment No. 629 is represented, which 

 shows the rhombic scars to good advantage. 



Gycadeoidea heliochorea n. sp. 



Trunks very large, the largest probably 50 cm , ellipsoidal or 

 nearly globular, flattened at the summit where a small terminal 

 bud is set in the center of abroad surface occupied by the 

 small, spirally arranged scars of the upper leaves, laterally com- 

 pressed to an unknown extent, all the specimens probably rep- 

 resenting the broader sides, unbranched ; rock soft, reddish 

 brown, rather fragile, of low specific gravity ; organs of the 

 armor ascending in all the specimens, but these all belong to 

 the upper"part ; phyllotaxy not traceable ; leaf scars obscurely 

 shown, subrhombic or rhombic, the upper vertical angle as 

 sharp as the lower, 25 mm wide and 15 mm high in the larger 

 examples, diminishing to the size of bract scars; leaf bases 

 rough and structureless, often sunk 2-3 cm below the surface, 

 showing in a few cases faint traces of bundles in the form of 

 projections from the bottom of the scars or ribs in the sides 

 above the bottom ; walls very thick and irregular, of the same 

 texture as the leaf bases, presenting a rough, jagged, and 

 uneven surface with scarcely any longitudinal arrangement or 

 subdivision into plates; reproductive organs very numerous 

 and prominent, nearly covering the surface to the exclusion of 

 the leaves, usually projecting 3 or 4 cm as decorticated cones, 

 sometimes absent, having fallen out, leaving deep, bowl- 

 shaped cavities, usually large, attaining a diameter of 4 X7 cm , 

 but smaller ones are also common, surrounded by numerous 

 and conspicuous, concentrically arranged, involucral bract scars, 

 the inner bracts themselves still present forming involucres to 



