CONTENTS 



1. Explorations and field-work of the Smithsonian Institution in 



1919. May 10, 1920. 80 pp., 'j'j figs. (Publ. no. 2881.) 



2. HoLLiSTER, N. Two new East African primates. January 22, 



1920. 2 pp. (Publ. no. 2582.) 



3. Dixon, H. N. Reports upon two collections of mosses from 



British E^st Africa. September i, 1920. 19 pp., 2 pis. (Publ. 

 no. 2583.) 



4. RiDGWAY, Robert. Diagnoses of some new genera of birds. 



December 6, 1920. 4 pp. (Publ. no. 2588.) 



5. Maxon, William R. New selaginellas from the western United 



States. December 22, 1920. 10 pp., 6 pis. (Publ. no. 2589.) 



6. Explorations and field-work of the Smithsonian Institution in 



1920. May 12, 1921. 126 pp., 138 figs. (Publ. no. 2619.) 



7. Clark, Austin H. Sea lilies and feather stars. April 28, 192 1. 



43 pp., 16 pis. (Publ. no. 2620.) 



8. WiNGE, Herluf. a review of the interrelationships of the 



cetacea. July 30, 1921. 97 pp. (Publ. no. 2650.) 



9. Britton, N. L. and Rose, J. N. Neoabbottia, a new cactus genus 



from Hispaniola. June 15, 1921. 6 pp., 4 pis. (Publ. no. 

 2651.) 



10. FooTE, J. S. The circulatory system in bone. August 20, 1921. 



20 pp., 6 pis. (Publ. no. 2652.) 



11. Clark, Austin H. The echinoderms as aberrant arthropods. 



July 20, 1921. 20 pp. (Publ. no. 2653.) 



12. Wetmore, Alexander. A study of the body temperature of 



birds. December 30, 192 1. 52 pp. (Publ. no. 2658.) 



13. Aldrich, L. B. The melikeron — an approximately black-body 



pyranometer. January 25, 1922. 11 pp. (Publ, no, 2662.) 



14. Gilmore, Charles W. A new sauropod dinosaur from the Ojo 



Alamo formation of New Mexico. January 31, 1922. 9 pp., 

 2 pis. (Publ, no. 2663,) 



15. Explorations and field-work of the Smithsonian Institution in 



1921, May 26, 1922. 128 pp., 132 figs. (Publ. no, 2669,) 



(v) 



