462 . Joseph Henry. 
Atrypa hystrix Hall,* and Productus (Productella) dissimitlis 
Hall. 
It is an interesting fact that of the twelve determined species, 
six occur only in the shaly deposits at the opening and close of 
‘the Devonian, ac eg rd these deposits are separated by 
150 feet of limestones. Only one species is known to 
from the lower shale into she uriadiend above, and even that 
appears under a form so altered that specimens from the two 
beds may be distinguished as readily as if they were distinct 
the Atrypa reticularis of No. 1, also finds its nearest representa- 
tive, not in ws limestones immediately above, but in the 
shales at Roe 
itions more favorable to them a iy the deposition of the 
Rockford Shales 
The intimate felation between the two extremes of the group 
ean but strengthen the conclusion of Dr. White, that all the 
Devonian strata of Iowa belong to a single epoch. 
JosepH Henry, LL.D. 
Proressor HENRY died, on the thirteenth of May, 1878, 
at his home in the Smithsonian Institution, Washington City. 
For over half a century Professor Henry has been one of the 
remost men of science in the United States ; and his name is 
well known in all countries where science »: cultivated. He 
was, it is believed, the last of that band of the older men 
of science in America, dating from the last century, baving 
been the associate during his ato of Hare, Silliman, Bache, 
— and others of the sa epoch. His eminent attain- 
ts and important niisaweczion early gave him a well earn 
reputation as an original heresy Later his skill as an 
* The fo as A. hys ffers conspicuously from the 
form described in the hte gee Towa, 1858, bos i, part 2, p. 515, under the name 
ie te ale i is last form is very abundant in tl 
Independence Shale are 
The specimens cal with | 
the form presented by this pening in the Rockford s one For eoomondian of 
nnual Report of Board 
this specific name to this special form. see Tw: 
of Regents on New York Stato Cabinet, p Hr gesepere 
