JURASSIC CYCADS FROM WYOMING. 187 



The largest specimen is No. 100.204, weighing 2.1 kg., but this is 

 supplemented by No. 500.507, weighing 0.98 kg., which nearly doubles 

 the area of surface exposed and shows the characters more clearly than 

 any of the original types. The specimen thus reconstructed is a segment 

 from the side of a large trunk, probably near the base, and extending 

 quite to the middle. The diameter, which is still not complete, is 23 cm. 



Still more important was the discovery that the large fragment 

 No. 500.511, weighing 1.54 kg., forms part of the type specimen No. 

 500.38, and exactly matches the fractured face represented in pi. cii of 

 the first paper, completing the upper part. As a surplus of good for- 

 tune it was also found that the smaller fragment No. 500.516, weighing 

 0.65 kg., fits both these specimens in such a manner as to extend the 

 part covered by its entire thickness of about 4 cm. This brings it within 

 5 cm. of the basal fracture, and we now have over two-thirds of the 

 trunk. 



One small specimen, No. 100.250, weighing 0.43 kg., was found to 

 belong to the type specimen No. 500.80, which was itself only a frag- 

 ment and was not figured. It now becomes a respectable specimen. 

 The other case of complementary parts is that of Nos. 100.289 and 

 100.292, which are both small specimens, weighing together only 0.23 

 kg. and showing nothing that is not better shown by other specimens. 



PL XLIX is a view of the external surface shown in the segment 

 Nos. 100.204 and 500.507. 



Cycadella nodosa Ward. 



PI. L; PI. LI; PI. LII, Fig. 1. 



1900. Cycadella nodosa Ward: Proc. Wash. Acad. Sci., Vol. I, p. 271; Twentieth 

 Ann. Rep. U. S. Geol. Surv., 1898-99, Pt. II, p. 401, pi. cxiii-cxxii. 



Notwithstanding the small number of specimens in the later col- 

 lections referable to this species and the fact that none of them supple- 

 ment the original types, it has proved one of the most satisfactory of 

 the specific groups. This is due to the fact that it contains two com- 

 plete trunks that are quite as fine as any of the original types and two 

 others that are very nearly complete. 



No. 500.509 is a complete trunk weighing 1.65 kg. and closely resem- 

 bles the type No. 500.47, but is somewhat smaller. It has the con- 



