CONTENTS 



1. Bartsch, Paul. Two remarkable new species of marine shells 



from Florida. 3 pp., 1 pi., Jan. 26, 1939. (Publ. 3524.) 



2. Clayton, H. Helm. The sunspot period. 18 pp., 1 pi., 12 figs., 



Alar. 27, 1939. (Publ. 3526.) 



3. Kessel, Edward L. The embryology of fleas. 78 pp., 12 pis., 



May 1, 1939. (Publ. ^,^7-) 



4. Wetmore, Alexander. Five new races of birds from Venezuela. 



7 pp., Mar. 10, 1939. (Publ. 3528.) • 



5. Abbot, C. G. Utilizing heat from the sun. 11 pp., 4 pis., 1 fig.. 



Alar. 30, 1939. (Publ. 3530.) 



6. Schmitt, Waldo L. Decapod and other Crustacea collected on 



the Presidential cruise of 1938 (with introduction and station 

 data). 29 pp., 3 pis., 2 figs., June 15, 1939. (Publ. 3531.) 



7. Cook, O. F. A new palm from Cocos Island collected on the 



Presidential cruise of 1938. 26 pp., 26 pis., May 29, 1939. 

 (Publ. 3532.) 



8. Killip, Ellsworth P. Flowering plants collected on the Presi- 



dential cruise of 1938. 4 pp., May 27, 1939. (Publ. 3533.) 



9. Taylor, Wm. Randolph. Algae collected on the Presidential 



cruise of 1938. 18 pp., 2 pis., 14 figs., June 23, 1939. (Publ. 



3534-) 



10. Bartsch, Paul, and Rehder, Harald Alfred. Mollusks col- 



lected on the Presidential cruise of 1938. 18 pp., 5 pis., 

 June 13, 1939. (Publ. 3535.) 



11. Clark, Austin H. Echinoderms (other than holothurians) 



collected on the Presidential cruise of 1938. 18 pp., 5 pis., 

 June 2, 1939. (Publ. 3536.) 



12. Deichmann, Elisabeth. A new holothurian of the genus 



Thyone collected on the Presidential cruise of 1938. 7 pp., 

 3 figs., June 14, 1939. (Publ. 3537.) 



13. Hartmax, Olga. The polychaetous annelids collected on the 



Presidential cruise of 1938. 22 pp., 3 figs., June 9, 1939. 

 (Publ. 3538-) 



14. Ginsburg, Isaac. Two new gobioid fishes collected on the 



Presidential cruise of 1938. 5 pp., 2 figs.. May 31, 1939. 

 (Publ. 3539.) 



(v) 



