274 =F. B. Meek—Descriptions of new Silurian Fossils. 
It was of circular section 4} inch in diameter, and was bent cold 
through an angle of 90° without showing fracture. 
XI. 1 2. Average. 
Silicon, "717 “722 "719 
Phosphorus, 206 "202 204 
Manganese, "273 "268 *270 
Sulphur, 035 037 "036 
Total Carbon, 1°840 1°844 1°842 
From this analysis it may be inferred that the silicon may run 
as high as 0-7 per cent without effecting the toughness of the 
annealed product, while it also tends to show, what might cer- 
tainly be expected, that an iron low in phosphorus and sulphur 
is most suitable for making malleable iron. 
n regard to the chemical processes used in making the above 
analyses, in most of the important points I followed the 
methods for the analysis of iron and steel, given in the last 
American edition of Fresenins, and I departed from these meth- 
ods only in such details as Prof. Allen, of the Sheffield Scien- 
tifie School Laboratory, kindly recommended. All the spect 
mens examined except, No. XI, were obtained from Messrs. 0. 
B. North & Co., of New Haven, whose courtesy in specially 
preparing and re-annealing the iron for this investigation 1S 
gratefully acknowledged. : 
es 
Art. XXX VI.—Deseriptions of a few new species, and one new 
genus, of Silurian Fossils, from Ohio ;* by F. B. MEEK. 
PROTASTER ? GRANULIFERUS Meek. 
Disk small, apparently circular; rays rather slender, and of 
unknown length. Dorsal surface of disk and rays covered y 
an integument composed of innumerable minute graims 0 
calcareous matter. Ventral side of disk not well exposed 1 
furrow into two parts, the anterior one of which is very short, 
and the posterior longer and marked by a minute pit at its 
* These fossils are to be fully illustrated and described in the report of the Obio 
