~ 
Geology and Mineralogy. 153 
on page 98, from which it appears that of the twenty-eight 
described species only six are peculiar to China and of these only 
two, Nucleospira Takwenensis and Orthis Richthofeni, are dis- 
tinetly different from any found elsewhere; the other four Chinese 
species having representatives in Europe or America, to which 
they are so closely allied that they may perhaps be only varieties. 
_ On page 199, Kayser begins a still more interesting and suggest- 
ive review of the Carboniferous fauna, in which he enumerates 55 
Species, only ten of which are considered as new. But two new 
generic names appear in the list, one a coral, Richthofenia, first 
obtained from India, and the other a fish tooth, Leptodus, allied 
to—if indeed it is generically distinct from—Deltodus cingulatus 
N. and W. from Illinois. 
Figures of Cambrian trilobites occupy two plates. These are 
wonderfully like the illustrations of the Primordial fauna given by 
ngelin from Sweden, Hall from New York and Walcott from 
Nevada, and evidently represent essentially the same group of 
organisms. 
It has been urged that our representation of the Primordial 
fauna is too fragmentary to permit generalization in regard to its 
zoological character and affinities. But we have now gathered 
d widely sepa- 
rated localities affords demonstrative evidence that they typify 
s 
he has assigned new generic names; for example, to the trilobite 
Sah YPY. : 
two trilobites from Utah described by Hall, in King’s Fortieth 
ceps 
and D.? gothicus. Similar trilobites, and sped belonging to 
the Same genus, have been found by Walcott in : 
the material representing large organisms of complicated structure 
* 
