CONTENTS. 



Advertisement iii 



List of OflBcers, Members, and Regents viii 



Article 1 (1T18). The Young of the Crayfishes Astaciis and Cambarns. By E. A. Andrews. 

 Published 1907. 4to, 79 pp., 10 pis. 



Article 2 (1723). The Apodous Holothuriaus. A Monograph of the S)-naptidae and Mol- 

 padiidae, including a Report on the Representatives of these Families in the 

 Collections of the United States ISTational Museum. By Hubert Lymax 

 Clark. Published 1907. 4to, 2.31 pp., -13 pis. 



Article 3 (2382). A Contribution to the Comparative Histology of the Femur. By J. S. 

 FooTE. M. D., edited by Ale5 Hhdlicka. Published 1916. ix, 242 pp., 38 pis. 



XI 



