FOSSIL CYCADEAN TRUNKS FROM WYOMING 201 



homogeneous in texture; walls i-3mm thick, relatively hard and light 

 colored; reproductive organs few, abortive or immature; thickness of 

 armor unknown; wood 3cm thick ; outer zone icm thick, coarse; 

 inner zone 2cm thick, finer and longitudinally striate; medulla ellip- 

 tical, 3 X 5cm in diameter, coarse and homogeneous. 



No. 500.83 of Professor Knight's collection, which constitutes the 

 species, is in all respects a unique specimen, and notwithstanding its ap- 

 parent deformity there is evidence that this is by no means wholly due 

 to external agencies. The position in which the trunk grew no doubt had 

 much to do with this, but it probably represents a dwarf, flat, branch- 

 ing species, all the members of which would present most of these 

 peculiarities. When inverted and laid on its back, the terminal bud 

 down and the base uppermost, it has much the shape of a broad low 

 wooden shoe or sandal, the thicker end representing the heel and the 

 thin flattened end, which is a sort of terminal bud of one of the lat- 

 eral branches, representing the toe — a comparison which suggested 

 the specific name. 



It weighs 1.45 kilograms. 



CYCADELLA GELIDA n. sp. 



Trunks rather large and relatively tall (the largest of the speci- 

 mens 39cm high, i2X20cm in diameter), subcylindrical, slightly di- 

 minishing from base to summit, laterally compressed, having a few 

 secondary axes, terminating in a large conical bud, the base project- 

 ing; rock of medium hardness and specific gravity, light brown on 

 weathered surfaces, nearly black within and on freshly exposed por- 

 tions; organs of the armor slightly ascending; rows of scars from 

 left to right making an angle with the axis of 45°, those from right to 

 left of 50°; leaf scars subrhombic, 20-25mm wide, 8-1 2mm high; 

 leaf bases rough and punctate; walls i— 2mm thick, friable, white, 

 with a median line or crack ; reproductive organs well developed, 

 usually raised or projecting, elliptical in cross-section, 2X 3cm in diam- 

 eter or larger, the involucral bracts not visible, the central portions 

 solid and amorphous; armor i-3cm thick, joined to the axis by a 

 more or less definite line, all within it a black undifferentiated mass 

 of cherty and apparently structureless matter which tends to crack 

 into cubes or flake off. 



The large fine specimen. No. 500.1, scarcely injured by being 

 broken in two by an obliquely transverse fracture near the base, was 

 at first supposed to be altogether unique, but in my efforts to correlate 

 the fragment No. 500. 24 of a considerably smaller trunk I found that it 



