*» 
S. W. Ford—Additional Embryonic Forms of Trilobites. 257 
other forms composing the local fauna (that of Troy, N. Y.,) 
; 1 relationships 
h 
better appreciated by a succinct restatement of it, and it 
ogi a to this: that four out of five of the fixed characters 
0 
macropleurism, we but a single embryonic character 
linking this species with Paradoxides the case w e 
different, but ere have a whole congeries of such char- 
acters, clearly and unmistakably shown. It is true that, in his 
later’ writings ‘ (1879), M. Linnarsson refers to P. Ajerulfi as 
Paradoxides (Olenellus) Kjerulfi; but in 1877, shortly after the 
publication of my former article, we find him changing the 
, if we take into account the entire known 
Tange of. structural characters under the genus Paradoaides, I 
See hothing, at present, in the finished form of O. asaphovdes, 
that can be regarded as absolutely distinctive, except the seg- 
ment furrow. If it be true that O. asaphoides has resulted from 
