WARD.] JURASSIC CYCADS FROM WYOMING. 407 
belonged with it, but there was a short interval between them, as 
they do not acy match. " 
The weights of the several fragments in the order of the ater 
are as follows: “a 
iKilogeams, 
BU GINA ie pe LS) NAIL Sa an stn 2a 1.02 
Nos BOUL O loci: FRc ath a pera: 2.41 
Mos BOO MO acre cease! We Dat oa anes A ae acetate 2.04 
Bo Oe eB at Seasanseaneatetl tae: 1.50 
PVG BI eels NS nace hae cee ae Dinas eR ina an 1. 64 
BU SG i ake Ais tae INS ER asa oe teen nadua 2, 55 
Bio BOS een d ele an nina d calicllnne thee ids ee cer eae 1.70 
ING OO diced ae cua nesta dentate nad cocmmcuaee 1.53 
BRO) Ginecol ane gt a ee 2.33 
PRG) DS iG scpguicse ance te es et rei A 0. 68 
The large combination, therefore, has a total weight of 8.19 kilo- 
grams, and Nos. 500.50 and 500.60 together weigh 4.08 kilograms. 
The specific name is not meant to imply that there is anything excep- 
tional in the ramentum of this species, although most of the specimens 
have a well-developed outer coating of it; but some of the fractures 
afford fine examples, and the detailed study of the generic characters 
has chiefly been made on this species and C. Knowltoniana. 
Pl. CX XXVIII illustrates the cylindrical form of the trunk, of 
which Nos. 500.34, 500.39, and 500.55 are believed to be detached por- 
tions. Although none of them fit naturally, their size and general 
appearance justified this assumption, and it is not probable that the 
interval is very great between them. No. 500.55, represented by Fig. 3, 
is considerably thicker than No. 500.39, represented by Fig. 2, i. e., the 
longitudinal fracture of the latter is nearer the surface exposed, while 
in the former it falls on the other side of the center. No. 500.34 
extends entirely across the trunk, and forms its apex complete. 
No. 500.55 shows that the trunk was somewhat contracted at the base, 
but the rapid narrowing of No. 500.39 (Fig. 2) is due to the longitudinal 
fracture being considerably oblique to the axis, so that the upper end 
is much thinner, and therefore narrower, than the lower. Only occa- 
sionally can any of the organs of the armor be detected. Pl. CK X XIX, 
Fig. 1, is a view of the upper transverse fracture of No. 500.55, and 
Fig. 2 of the lower transverse fracture of No. 500.39. It is from this 
latter that microscopic slides were made after the views had been taken. 
Reproductive organs may be seen in longitudinal section on both these 
faces. Pls. CXL and CXLI show the restoration of the portion of a 
trunk represented by the complementary fragments Nos. 500.45 (a), 
500.40 (6), 500.66 (c), 500.43 (d), and 500.81 (e), forming a good part of 
another very interesting trunk belonging to this species, the first being 
a view of the external surface, almost wholly covered with the ramen- 
tum layer, and the second a view of the longitudinal fractures. 
Pl. CXLU, Fig. 1, isa view of the transverse fracture of the lower 
