﻿IO INTRODUCTORY. 



The types of the remaining species are in the Yale Museum, New Haven, as 

 follows : Cycadeoidea ingots, Sti/kceiii, rlwmbica, aspera, cicatricula, formosa, helio- 

 chorea % utoptensis, furcata, insolita, Marskiana, minima, nana, protea, reticulata, 

 tairita, superba, Il'ei/sii, and Wielandi (all Ward's species). The museum numbers 

 of these tweuty-uine ascribed types are to be found in Professor Ward's papers 

 (175, 176, 179). It should be noted that these Black Hills species are seldom based 

 on a single specimen, and that they are at present represented by nearly 1,000 

 more or less complete trunks, as included in the collections of the Yale University 

 Museum, the United States National Museum, the museum of the State University 

 of Iowa, and the American Museum of Natural History.* 



THE CYCAD LOCALITIES OF CENTRAL WYOMING. 



The third of the greater American cycad localities is that of the Freezeout 

 Hills of Carbon County, Wyoming. Its discovery and Upper Jurassic age were 

 first announced in August, 1898, by Prof. O. C. Marsh (90). The fine series of 

 silicified trunks thus far yielded by this locality gives it about the relative strati- 

 graphic value and importance ot the cycad horizons of Maryland, if we except the 

 additional interest due to the fact that its equivalence to the lower of the two cycad 

 beds of the Black Hills has been positively determined. 



Professor Ward, who has made a careful examination, based principally on the 

 macroscopic characters of the large collections from the Freezeout Hills, assigns 

 all the specimens to his new genus Cyeade/ia, and refers them to twenty species- 

 Of these twenty species the types of two, namely, Cycadella Beecheriaua and Recdii, 

 belong to the Yale Museum. The remainder belong to the museum of the Uni- 

 versity of Wyoming, at Laramie, and the U. S. National Museum. The entire list 

 of Wyoming species appears on the following page. 



Although silicified cycad trunks are positively known to occur in the Atlanto- 

 saurus horizon in the southern "Rim" of the Big Horn Mountains, the writer was 

 not fortunate enough to find any examples when he visited that region in August, 

 1902. He had been previously informed by the late Professor Wilbur F. Knight 

 that he himself had seen one fine specimen from the Southern Big Horns. As was 

 subsequently learned, this fossil came from the Big Horn Rim, about 6 miles south 

 of Houk post-office, and its finder, a sheep-herder, who tenaciously withheld it, was 

 finally relieved of its care by unknown parties. 



CALIFORNIA. 



The most recently discovered American locality yielding silicified cycad trunks 

 is in the Grapevine Valley, Colusa County, California, 6 miles west of Sites, on the 

 road to Stony Ford, at Prior's ranch. Here a truuk of much the same size and gen- 

 eral features as Cycadeoidea marylandica was secured in September, 1900, and added 



*One fine trunk from Minnekahta, in the southern Black Hills, was presented some time in 1894 by 

 Professor Macbride to William Carruthers, and is in the British Museum at South Kensington. 



