EEPORT OF THE ASSISTANT SECEETAEY. 63 



(172.) Palaeontology of the Upper Missouri. By F. B. Meek and F. V. 

 Hayden. 4to. 



(165.) Monograph of North American Bats. By Harrison Allen, M. D. Svo. 



(173.) On the Microscopic Structure of the Medulla Oblongata and the Tra- 

 pezium. By Dr. John Dean. 4to. 



(175.) Discussion of the Magnetic and Meteorological Observations of Girard 

 College. By Prof. A. D. Bache. Part VII, VIII, IX. 4to. 



(179.) List of publications of learned societies, periodicals, and encyclopaedic 

 works in the library of the Smithsonian Institution, July 1, 1863. 



(178.) Monograph of North American Hymenoptera. By H. De Saussure. 

 Part I. Edited by Edward Norton. Svo. 



