1891.] Progress of American Invertebrate Paleontology. 329 
and Tracks of Invertebrate Animals in Paleozoic Rocks, and 
Other Markings, in the Quarterly Journal of Geological Society of _ 
London, Vol. XLVI., pp. 595-618 ; and On New Species of Fos- 
sil Sponges from the Siluro-Cambrian at Little Metis, on the 
lower St. Lawrence, in Transactions Royal Society of Canada, 
Vol. VIL, Sec. iv., pp. 31-55. 
In the Canadian Record of Science, Vol. IV., pp. 104—109, 
William Deeks gives a List of Fossils from the Lower Helderberg 
formation of St. Helen’s Island. 
W. W. Dodge notes Some Lower Silurian Graptolites from 
Northern Maine, in the American Journal of Science (3), Vol. 
XL., pp. 153-155. 
P. Martin Duncan, in the Journal of the Linnazan Society, - 
Vol. XXIIL., pp. 1-311, gives a Revision of Generic and Great 
Groups of the Echinoidea. 
R. W. Ells lists many fossils in his Second Report on the 
Geology of a Portion of the Province of Quebec; Annual 
Report Geological and Natural History Survey of Canada, Vol. 
HI; Report K. 
Oliver Everett with E. O. Ulrich describes some new Silurian 
sponges, in the Geological Survey of Illinois, Vol. VIII., pp. 
253-282. 
A. H. Foord revises the Group of Nautilus elegans Sowerby; 
Geological Magazine (3), Vol. VII., pp. 542-552. 
C. H. Gordon gives his Observations on the Keokuk Species 
of Agaricocrinus, in the American Geologist, Vol. V., pp. 257-261; 
and On the Keokuk Beds at Keokuk, lowa, in the American 
Journal of Science (3), Vol. XL., pp. 295-300. 
James Hall has an abstract On New Genera and Species of 
the Family Dictyospongide, in Bulletin of the Geological Society 
of America, Vol. I., p. 22. Also Some Suggestions Regarding ` 
ing the Subdivisions and Grouping of the Species Usually 
Included Under the Generic Term Orthis, in Accordance with 
the External and Internal Characters and Microscopic Shell 
Structures; pp. 19-21 of same publication. 
A Pilisiiaey Catalogue of the Fossils Occurring in Missouri 
t 
