XVII 
ÉTATS-UNIS. 
* Boston. American Academy of arts and sciences. 
* — Society of natural history. 
* Cambridge. Muséum of comparative Zoology. 
Davenport. Academy of natural sciences. 
* Denver. Colorado scientific Society. 
Hamilton. Hamilton Association. 
Madison. Wisconsin Academy of sciences, arts and 
letters. 
* Minneapolis. Ceological and natural history Survey. 
— Minnesoa Academy of natural sciences. 
* New Haven. American journal of science. 
— Connecticut Academy of arts and sciences. 
*NewYork. Academy of science. 
— Geological Survey. 
* — American Muséum of natural history. 
* — State Muséum of natural history. 
* — Science. 
Rochester. Academy of sciences. 
* Sacramento. California State mining bureau. 
* Salem. American Association for the advancement of 
science. 
* San Francisco. California Academy of sciences. 
St-Louis. Academy of sciences. 
Springfield , Geological Survey of Illinois. 
* Topeka. Kansas Academy of Science. 
* Washington. Geological Survey of the territories. 
* — United States geographical Survey. 
— Geological Society of America. 
* — Smithsonian Institution. 
Mexique. 
* Mexico. Sociedad cientifica Antonio Alzate. 
ANNALES SOC. GÉOL. DE BELG. T. XX. BULLETIN, 2 
