Review of Hall & Whitney's Geology of Iowa. 
The true generic charactersof Zeacrinus, Agaricocri- 
nus and Agassizocrinus of Toost,- genera which that 
author had given in his catalogue, but of which he had 
never published the full descriptions - are here for the 
first time given. In this and other cases, Mr. Hall 
has evidently aimed to recognize fully the unpublished 
labors of Prof. Toost. He has on page 544 the follow- 
ing note;- 
" I have transcribed these observations, as well as 
the specific description of this species from the MS, of 
Dr. Troost's memoir upon the Crinoideás, which is to be 
published in the Smithsonian Contributions to Knowledge; 
having been permitted to make such references and cita- 
۱ of the 
tions as would enable me to verify any, genera and spe- 
: 4 TD : : UN a 
cies which I might describe in the Iowa Report. By this 
means, although Dr. Troost's paper has not yet been 
C3 
published, he has the precedence which belongs to him." 
Am. Journ. Sci., Vol. XXVII, 1959, p. 114, 

