88 
canal near Cahooes Falls, in the State of New York, 
and at a number of other places in that State. 
I have named this species in compliment to my 
early friend, Professor Theodore Romeyn Beck, M.D. 
well known both at home and abroad, as the learn- 
ed author of the work on Medical Jurisprudence. 
Some time after commencing this little Monograph, 
I communicated my plan to Dr. Beck, and was sur- 
prised and gratified to find that he was also engaged 
with the same inquiries, and that he was then busy 
in arranging and examining the unique collection of 
trilobites belonging to the Albany Institute. With- 
out the smalles B@RLStion, be placed all his ‘speci- 
sal, and has facilitated otherwise 
y every means in his power. 
Genus Nutrainia. Laton. 
Professor A. Eaton, in his Geological Text Book, 
has proposed the Genus Nuttainia, to include two 
remarkable trilobites which could not properly be - 
arranged in any of the previously, established genera. 
The two fossils here grouped together, bear no gene- 
ric relation to each other. The first species which 
he calls N. Concentrica, belongs to the genus Crypto- 
lythus, which was proposed before the appearance of 
his work, and has therefore been noticed in another 
a 
place. 
The pow. Nuttajnia is Sar s characterized pe its 
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