396 
The American Geologist. 
June, 1896 
joints, and the pleural spines stand out directly from the body. The 
pleural groove has an unusual course along the front, but nevertheless 
terminates behind the spine. The genus takes its name from the retic¬ 
ulate ornamentation of the cheeks. A concluding note relates to the 
Carboniferous form Prestwichia crepini of M. Boulay. a. e. m. 
Beit rag zur Kenntniss dev Trilob iten-fauna im mdhrischen Devon 
bei Celechovitz. By F. Smycka. (Acad, des Sciences de l’empereur 
Francois Joseph I: Bull. Internat.; Class, des sci. math, etnat., pp. 1- 
9, pi. 1, 1895.) The author has brought together a considerable list of 
species from the Devonian limestones near Celechovitz in Moravia. 
These are of much interest as the rocks have been but little studied. 
“There has been no systematic investigation which would give us either 
a knowledge of the different strata and their parallel with the forma¬ 
tions of other countries, nor a conception of their organic life.” Follow¬ 
ing a list of about 60 species, which serve to indicate Upper Devonian 
age of the fauna, are descriptions of several trilobites, two of which, 
Proetas celechovicensis and P. inoravicus, are new. j. m. c. 
Ueber angebliche Orgamsmenresle aus pracambrisehen Schichten der 
Bretagne. By Hermann Raufp. (Neues Jahrb. fur Mineral., 1896, 
Bd. 1, pp. 117-138.) Barrois’ announcement in 1892 of the discovery of 
organisms in the Archean rocks of Brittany, followed by the more elab¬ 
orate memoirs of Cayeux in 1894-5, aroused the liveliest interest of pale¬ 
ontologists. These fossils have been described as radiolarians and 
spicules of sponges. Doubt is now cast over all these determinations by 
Rauff. After an examination of the original preparations showing the 
sponge spicules, the author pronounces them of inorganic origin, prob¬ 
ably minute aggregates of pyrite. Arguments are also adduced to show 
that the supposed radiolarians are also of similar nature. j. m. c. 
Some Notes on the Occurrence of Uranite in Colorado. By Richard 
Pearce. (Read before the Colorado Sci. Soc., Sept. 9, 1895; 3 pp.) 
The author states what is known of the occurrence of this rare and in¬ 
teresting mineral in the Wood lode, Leavenworth gulch, Gilpin county, 
about one and one half miles from Central City (not at Black Hawk, as 
stated in Dana’s System of Mineralogy). Mr. Pearce first found the 
mineral at the above locality in 1871, and soon after a considerable 
quantity of the uranite was extracted and sold in London. In 1894 the 
mine was again opened and another deposit of this mineral was found. 
Dr. W. H. Hillebrand pointed out that nitrogen was present in uranite, 
but recently Prof. Ramsey has discovered that the bulk of the gas re¬ 
garded as nitrogen is the new element helium. u. s/ g. 
