206 ntOCEEDINGS OF THE NATIONAL MUSEUM. 



upper side of the scars usually so indistinct as to make them appear 

 kidney-shaped, the lower side and ends consisting of a dark raised ring 

 or welt with a groove all round it and exterior to it, the central por- 

 tion occujtied by a number of i)unctations more or less concentrically 

 arranged; woody axis 9 to 12 cm. thick, of which the parenchyma occu- 

 l)ies somewhat more than half and is very porous except where traversed 

 by the medullary rays of firmer consistency; fibrous zone divided into 

 an outer soft and an inner harder ring, the inner wall of the latter con- 

 spicuously marked by the scars of the medullary rays; medulla in the 

 larger specimens 15 cm. in diameter, but usually elliptical and about 

 8 by 11 cm. of a uniform porous consistency. 



I name this species for Professor McBride because he was the first to 

 deal with it, although he confounded it with C. dacotcusu, and i)arts 

 of his description apply to the one and parts to the other species. Still 

 his figures are clear and leave no doubt that his tig. 2 belongs here. 

 In his description of that tiguro he says that it belongs to "another indi- 

 vidual," which of course would have been otherwise evident, and parts 

 of his description show that either this or other material in his hands 

 consisted of fragments showing the interior of the trunks, which could 

 not have been exposed in the -'large, perfect individual." Most of his 

 description! of the internal parts nuist have been based on such frag- 

 ments, and the following words appear to apply entirely to the present 

 species: "Leaves not known; their bases as perceived are fusiform or 

 lozenge-shape in cross section, one half inch by one inch in dimensions, 

 and show the remains^ of numerous e(j[ually developed fibro-vascular 

 bundles." 



His specimens seem to have come from exactly the same locality as 

 those purchased from Mr. Cole, which 1 subsequently visited in com- 

 pany with Professor and Mrs. Jenney, with Messrs. Cole and Payne as 

 our guides. TheVe was found the large branching specimen, C. minne- 

 kahtensis, and there, too, I picked up twelve fragments of different sizes 

 and shapes. These were numbered in continuation of the Black Hills 

 collection, of which there are seven nearly perfect trunks, and therefore 

 included Nos. 8 to 19. Of these six certainly belong to the present sj>e- 

 cies, namely, Nos. 8, 9, 10, 13, 14, and IG. Two of these fragments, 

 ]N^os. 10 and 11, are found on comparison to fit together and therefore 

 of course to belong to the same trunk. When jjlaced in their proper 

 position they constitute the greater part of it, but a large segment is 

 missing from one side. Among these specimens, all differently broken, 

 a much larger number of characters are exposed than could be seen in 

 any number of perfect trunks. Wherever two or more display the same 

 parts they are in substantial agreement, and it is therefore assumed 

 that such features as are only visible in some one specimen would be 

 found in the rest if the proper j)arts could be exposed. The beautiful 

 markings on the inner surface of the liber zone, as above described, are 

 to be seen only in specimen No. 16. That all trunks of the species were 

 of the short conical shape indicated by Nos. 10 and 14 when placed in 



