528: PUBLICATIONS RECEIVED. 
ployment of. a blowpipe-test. previously announced, by him for distinguishing the. 
protoxide: of iron; from the: peroxide of that, metal in. silicates and other. com- 
pounds, he had: “discovered. the presence of. FeQ: in, translucent crystals of. 
Staurolite;, a: mineral. hitherto supposed to be a: basic; silicate: of alumina in. 
which a portion, of the Al?Q® is, replaced. by, Fe?@*.” In Rammelsberg’s, 
analyses; as: in those of Jacobson, the higher the amount of silica, the lower that) 
of. the:alumina, and the reverse. E..J..C,. 
NOTICES OF PUBLICATIONS RECEIVED: 
Descriptions of New Paleozoic Fossils from Illinois and Iowa. By F.B. Meek 
and A. H. Worthen, Illinois State Geological Survey. In this communication, 
published. in the Proceedings of the Academy of Natural Sciences of Phila- 
delphia, June, 1861, the authors describe various new fornis of crinoids and’ 
other types. from the carboniferous rocks of Illinois and’ Iowa. Amongst the 
crinoids- they establish a new genus Bursacrinus, intermediate apparently be- 
tween Ichthyocrinus and Cyathoerinus, its generic formula being: Basals 57; 
Sub-radials.5 (four hexagonal and one pentagonal); Radials 2x5; Anal 1; 
Inter-radials.0;, Arms, 10,, bifurcating, but laterally connected. A sub-genus,. 
under the name of. 77rematodiscus, is also proposed for the reception of certain 
forms of Nautili. possessing a.discoid shell with a wide, shallow, and usually 
perforated umbilicus. It will include a group of carboniferous species of Euro- 
pean as well as of American occurrence. 
In a recent notice, contained in the May. number of the Canadian Journal, we 
fear we may unintentionally have done some injustice to the very able geologists. 
engaged on the Illinois Survey. In acknowledging a publication forwarded by 
Prof. Hall, we-stated that’ the descriptions'of fossils’ which: this’ comprised had 
been issued in order to claim’ priority for various new species that might. pro. 
bably appear under‘ other names’ in the forthcoming Report of the Geology of? 
Illinois, since’ the publication of the‘ concluding’ portions of the Report! on:lowa 
(under Prof. Hall’s direction), had: been suspended for a time. In’ making this 
remark, we did not for a moment’ intend'to imply that Messrs: Meek and Worthen: 
would intentionally re-describe any published form under another name; but’ 
simply that, where: several observers: were engaged on:the: same kind of: work, 
coincidences of this: sort: were) more or ‘less unavoidable. We: find. that:a:large: 
number of the: fossils. about to: appear in the: Illinois Report; were briefly>des=: 
cribed: in the proceedings of. the: Philadelphia’ Academy in. September. andi 
October, 1860 ;, and: we:understand: thati every cate. has been: taken, in drawing 
up this Report, to: avoid: the: introduction of: synonymes. The: Report itselfy. 
with figures. and: extended: descriptions; will: be issued during: the: forthcoming: 
year: 
Lhe Primordial Zone: of Teéas; with: Descriptians of New Fossils. By 'B. F 
Shumard: (From the American.Journal of Science and Arts, September, 1861), 
The occurrence of Lower Silurian strata: in Texas’ (subsequently reférred by 
Barrande to the Primordial Zone) was announced by Ferdinand: Roemer in 1853: 
Prof. Shumard,.in:1859, shewed their occurrence: over’ a much more’ extended: 
