L. F. Ward — Fossil Cycads in the Yale Museum. 345 



suggest that the trunks, like those of the "coontie," may have 

 developed entirely below the surface. 



I have selected for illustration of this species the somewhat 

 exceptionally regular, but still fairly characteristic specimen, 

 No. 457, represented on Plate IV. This is a chiefly top view, 

 showing the three nearly equal systems or branches, each with 

 its apical scars and central bud perfectly preserved. 



We now have, therefore, 29 species of fossil cycadean trunks 

 from the Black Hills, all of which are represented in the Yale 

 collection. To any one interested in the extinct floras of 

 America this collection can scarcely fail to appeal in an especial 

 manner. But we are probably only at the threshold of the 

 subject. Not only will the raw material continue to accumu- 

 late, but as we penetrate deeper into the inner structure it is 

 safe to predict that the results will be such as even the bota- 

 nists proper cannot afford to ignore. 



EXPLANATION OF PLATES. 



Plate II. 



No. 629. — Cycadeoidea rhombica Ward; type; side view. From near Black- 

 hawk, South Dakota. 



No. 53. — Cycadeoidea minima Ward; type; side view. Minnekahta, South 

 Dakota. 

 (The numbers refer to the catalogue of the Tale Collection.) 



Plate III. 



No. '721. — Cycadeoidea utopiensis Ward; type; side view. From west of the 



Black Hills, Wyoming. 

 Nos. 137, 146. — Cycadeoidea superba Ward; type; side view. Minnekahta, 



South Dakota. 



Plate IV. 



No. 722. — Cycadeoidea heliochorea Ward ; type ; side view. From ten miles west 



of Sundance, Wyoming. 

 No. 342. — Cycadeoidea reticulata Ward ; type ; top view. Minnekahta, South 



Dakota. 

 No. 457. — Cycadeoidea protea Ward; type; top view. Minnekahta, South 



Dakota. 



