.11 KASSIC CVCADS FliO.M TllK I'.LACK IIILl.S. 203 



PI. L.XIl, I'itr. I. Scnvard's figure of ;i fine fi'oud of W illidmsonia 

 gi'gn>< ( I.. iV Il.i ('an-., pi. \- of the .Iiii-assic I'lora of ^'ol•kshil•<^ Part T. 

 Natural size, cf. PI. LXII, V\ii. 1. 



Note.— PI. LXII, Fio-s. l-;i, ami PI. LXllI. 1' i,u-. I. aic from the 

 Univoi'sity of \\'yomin<i: cycads No. o()().;-59, figured on pi. cxxxviii, fig. 

 2, of \hv finst paper on the Meso/.oic Mora. 



jriiA.ssic c'i ('Ai).s i'i;«):m nil. I'.i.vc k hills. 



On all sides of the Hlack Hills the -lurassie always immediately 

 overlies the Ped Beds and underlies the Lo\v(>i' Ci'etaceous (Lakota 

 formation of Darton). This last is the soui'ce of the great numbers 

 of eycadean tmniks that 1 have deso-ihed from the Blaek Hills. These 

 occui- about midway of that formation, and below the cycad horizon 

 are \-arious plant beds containing impressions of c.ycadaceous vegeta- 

 tion. Until recently no plants except fossil wood had been found in 

 the underlying Jurassic t)eds, the upper member of which is the Beulah 

 formation (Beulah clays of Jenney), in which occur the Atlantosaurus 

 beds of Marsh. When I made my fourth and last visit to the Yale 

 Museum, in May, 1900, to complete the elaboration of the great collec- 

 tions of cycads that Professor Marsh had so mvmificently accumulated 

 there, I found one ver}' anomalous specimen that had been purchased 

 for Professor Marsh l)y Mr. H. F. Wells from a dealer in Hot Springs 

 who had ol)tained it from a stranger and had no record fiu'ther than 

 that the man who sold it to him had told him that he obtained it "50 

 miles west of Hot Springs in Wyoming." I named the new species, 

 which it clearly constituted, Cycadeoidea utojdensis, but in the descrip- 

 tion 1 stated that on the surface there was "an area near the summit 

 covered by what appears to be an outer coating of ramentum, as in 

 the genus Cycadella, more or less obscuring the organs." At the end 

 of the discussion I .said: "The patch of I'amentuni, if such it be, near 

 the summit of the specimen, raises the suspicion that it may l^elong 

 to the genus Cycadella, and, as all the specimens of that genus thus far 

 known have come from the Jiu'assic, it is possible that the horizon of 

 the bed holding this specimen may be lower than that of the other Black 

 Hills cycads." I also discussed the piobablc locality and regarded it 

 as "more pi'obable that the direction was northwest from Hot Springs, 



