Geology and Mineralogy. 493 
thereof. All those who intend to be present are at the same time 
invited to send, as soon as possible, a list of the questions which 
seem to them worthy of general discussion, as well as of the com- 
munications which they intend to make touching these questions. 
They are also invited to indicate What time appears to them mos 
convenient for the meeting of the Congress 
regards an International Geological Exhibition, the Paris 
Committee of organization state that the difficulty of finding a 
suitable locality seems to them an obstacle in the way of realizing 
this part of the programme. They hope however that there will 
e many special pallsetions sent, and beg the exhibitors of such 
to give the committee due notice of these, in order that a special 
catalogue of them may be prepare 
The circular issued by t e Committee of the American Associa- 
tion did not contemplate, as Dr. Hunt states, the holding of an 
International Geological Exhibition apart from the Universal 
Exhibition, but, in 5 or guage of that circular, the making as 
e pegs department of the Universal 
Exhibition. It is that, as at all previous similar exhibi- 
tions, the different eaten will contribute more or less of geo- 
logical terial; an yas conceiv hat such collections, 
International Geological Exhibition. To the accomplishment of 
this end it will only be necessary for the exhibitors of all nations 
to sehd a list of their Por contributions to the local Com- 
mittee of organization at Pari 
All correspondence oaien to the ye oe should be addressed 
by Dr. Jannetaz, Sécretaire-général, Rue rands si apace 
7, Paris, France, and all moneys sent to Dr: Bioche at the sam 
ac ress, 
3. Paleontology of New York, Illustrations of Devonian 
Fossils: Gaster opoda, Pte sh Ale Cephalopoda, ¢ 
nse : 
IV of Professor Hall’s great work on the Paleontology of New 
k was published in 1867, and contained descriptions and fig- 
ures of the fossil Br: achiopods of the Upper Helderberg, Hamilton, 
Portage and Chemung ype illustrated by about seventy rec 
Since its publication, as reface to this new volume states 
with the care of the Museum, in connection with impaired health, 
the descriptions still remain incomplete. In 1875, eighty plates 
of the Lamellibranchs had been drawn and litho graphed, and the 
drawings of the greater part of the Gasteropods, Pteropods, 
Cephalopods and Crustacea, now issued in this new volume, had 
