350 AMERICAN JOURNAL 



I. H. Vancouverensis, sportella, Yoyaxa. 



m. " Cronkheitii, Durantii, conspecta. 



n. " Whitxeyi, Breweri, fulva. 



0. " Without affinities. Newberyaxa and mormonum. 



It is interesting to note tlie difference in measurement of the 

 extremes in size of the larger species. The following table 

 illustrates the variation in some few of them, in inches : — 



Large Diam. Small Dlam. Elevation. 



H. fidelis, 

 H. arrosa, 

 H. ramentosa, 

 H. tudiculata, 

 H. Nickliniana, 

 H. mormonum, 



n. Townsendiana, 



It will be understood that these are not such measurements 

 as should be given in a description, but an average-sized speci- 

 men should be selected for that purpose. Bj obtaining the 

 mean of the two, we shall arrive at about the ordinary size; 

 i. e.: in H. fidelis^ take the sum of the largest and smallest, 

 selected from some hundreds of specimens, 



1-50 ( 0.70 -^ 9=l-34 



the fair average greater diameter. 



It will be noticed that a number of species, usually credited 

 to California, are omitted in this list. It has been my design 

 to include all worthy of a place in an accurate catalogue, and 

 to pass by those that are extra limital to the boundaries at 

 the head of this article, or are synonyms of those mentioned. 



In a future number, a catalogue, with their entire synonymy, 

 may be given. To attempt it now would, perhaps, be prema- 

 ture, and would occupy too much space in your valuable 

 Journal. W. N. 



