JURASSIC CYCADS FROM WYOMING. 191 



Cycadella ramentosa Ward. 



PL LV; PL LXII, fig. 1. 



1900. Cycadella ramentosa Ward: Proc. Wash. Acad. Sci., VoL I, p. 275, pL xiv, 

 figs. 4, 5; Twentieth Ann. Rep. U. S. GeoL Surv., 1898-99, Pt. II, p. 406, 

 pi. Ixx, figs. 4, 5; pi. cxxxviii-cxliv. 



A large number of fragments are referred to this species, mostly 

 on the strength of the characteristic internal structure, but many are 

 very doubtful and others quite worthless. Several, however, certainly 

 belong to the same trunks as the type specimens, and in two cases this 

 is proved by finding the planes of juncture. These are the specimens 

 Nos. 500.357 and 500.620, the former of which fits the end of No. 500.50, 

 and is in turn matched by the latter, thus extending the type specimen 

 some 8 cm. in one direction. A number of other fragments are undoubt- 

 edly parts of the trunk that was built up from the types Nos. 500.40, 

 500.43, 500.45, 500.66, and 500.81 (see pis. cxl and cxh), and some of 

 these are quite large. No. 100.248 weighs 0.57 kg. and shows the inter- 

 nal structure and external ramentum exceptionally well. It nearly 

 matches No. 500.40. No. 100.219 weighs 0.69 kg. and is very close to 

 No. 500.66, being a triangular piece like No. 500.81. No. 100.243 is 

 similar to the last, but smaller, weighing only 0.37 kg. All of these 

 would join that combination in different ways but for the loss of small 

 chips, many of which are in the collections. No. 100.205, weighing 

 0.9 kg., is perhaps part of the same trunk, but differs from the rest in 

 some respects. It shows considerable surface and has a good trans- 

 verse fracture. No. 500.201 is a fine segment weighing 1.15 kg. and 

 resembles the others, but there is no part missing in that trunk large 

 enough for it to go in. It shows structure unusually well. No. 100.214 is 

 the largest specimen of this species in the later collections and weighs 1.93 

 kg. It represents about half of a trunk which was compressed laterally 

 so as to form a sharp edge. It is 16 cm. in diameter in the direction of 

 this edge and 13 in the opposite direction across the large fracture, which 

 is obhque to the axis. The thickness of the specimen at right angles to 

 the plane of this fracture is 13 cm. The whole surface is covered with 

 a thick coat of ramentum and the structure is obscure on the fractures. 



PI. LV, Fig. 1, gives a side view of No. 100.214, and Fig. 2 the rough 

 fracture of No. 100.201. PL LXII, Fig. 1, shows the smooth fracture 

 of No. 100.248. 



