CONTENTS 



1. Abbot, C. G. Leading operations of the Smithsonian Astro- 



physical Observatory, 1895 to 1955. 8 pp. Sept. 22, 1955. 

 (Publ. 4222.) 



2. Peterson, Mendel L. The last cruise of H.M.S. "Loo." 55 



pp., 17 pis., 3. figs. Nov. 23, 1955. (Publ. 4224.) 



3. Fairchild, G. B. Synonymical notes on neotropical flies of the 



family Tabanidae (Diptera). 38 pp. Jan. 11, 1956. (Publ. 

 4225.) 



4. Cooper, G. Arthur. New Cretaceous Brachiopoda from Ari- 



zona. 18 pp., 4 pis. Dec. 21, 1955. (Publ. 4227.) 



5. Wetmore, Alexander. A check-list of the fossil and prehis- 



toric birds of North America and the West Indies. 105 pp. 

 Jan. 25, 1956. (Publ. 4228.) 



6. Gazin, C. Lewis. Paleocene mammalian faunas of the Bison 



Basin in south-central Wyoming. 57 pp., 16 pis., 2 figs. Feb. 

 28, 1956. (Publ. 4229.) 



7. Gazin, C. Lewis. The upper Paleocene Mammalia from the 



Almy formation in western Wyoming. 18 pp., 2 pis. July 31, 

 1956. (Publ. 4252.) 



8. Gazin, C. Lewis. The geology and vertebrate paleontology of 



upper Eocene strata in the northeastern part of the Wind River 

 Basin, Wyoming. Part 2. The mammalian fauna of the Bad- 

 water area. 35 pp., 3 pis., i fig. Oct. 30, 1956. (Publ. 4257.) 



9. Kilham, Lawrence. Breeding and other habits of casqued 



hornbills (Bycanistes sitbcylindricus) . 45 pp., 6 pis., 2 figs. 

 Nov. 8, 1956. (Publ. 4259.) 



10. Snodgrass, R. E. Crustacean metamorphosis. 78 pp., 28 figs. 



Oct. 17, 1956. (Publ. 4260.) 



11. Chadwick, L. E. The ventral intersegmental thoracic muscles of 



cockroaches. 30 pp., 18 figs. Jan. 15, 1957. (Publ. 4261.) 



(v) 



