Miscellaneous Intelligence. 447 
anew generic type forming a subdivision of the old genus 
Ww. 8. 
10. Observations on the Genus Unio; by Isaac Lea, LL.D.—In our 
notice of Dr. Lea’s Memoir we stated that the embryonic form of the 
shell in the case of 38 species of Unionide is figured without details on 
one of the plates. We intended to say without details on the plates. 
There are detailed descriptions occupying eight pages of the memoir. 
1]. Catalogue of the Described Coleoptera of the United States; by 
Fampricn Ernst Metsnerer, M.D., revised by 8. S. Hatpeman and 
J. LzConre. 174 pp. 8vo. 
12. Catalogue of the described Diptera of North America ; prepared 
for the Smithsonian Institution by R. Osten Sacxen. » 8yO, 
These two works were issued the past year by the Smithsonian Insti- 
tution. They are of great value to all interested in these departments 
of Entomology. 
IV. MISCELLANEOUS SCIENTIFIC INTELLIGENCE. 
tions have been made here to ascertain the character of the fluctuations 
of the level of Lake Michigan, one of the results of which was announ 
three hours during the month of August, 1849, I have ascertained that 
there is a slight lunar tide on ichigan.’ 
been prosecuted under the superintendence of Col. Gre ting } 
the discovery above noticed. The supposed influence is more noticeable 
at the period of the moon’s conjunction or oppos! “sea 
Weather, the observed extent of it being about. two-tenths of - . 
_ The brief announcement by Col. Graham will, it is hoped, | 
by a detailed statement of facts and data at a future day. 
