CONTENTS 



1. Clock, Waldo S. ; Studhalter, R. A. ; and Agerter, Sharlene 



R. Classification and multiplicity of growth layers in the 

 branches of trees. 292 pp., 36 pis., 51 figs. June 17, i960. (Publ. 

 4421.) 



2. Wetmore, Alexander. Pleistocene birds in Bermuda. 11 pp., 3 



pis., July 7, i960. (Publ. 4423.) 



3. Parkinson, Russell J. Dr. Langley's paradox : Two letters sug- 



gesting the development of rockets. 4 pp., 3 pis. Aug. 31, i960. 

 (Publ. 4424.) 



4. Lorenzo, Michael A. The cephalic nervous system of the centi- 



pede Arenophilus bipuncticeps (Wood) (Chilopoda, Geophilo- 

 morpha, Geophilidae). 43 pp., 5 pis., 5 figs. Nov. 8, i960. (Publ. 



4425-) 



5. Boardman, Richard S. A revision of the Ordovician bryozoan 



genera Batostoma, Anaphragma, and Amplexopora. 28 pp., 7 

 pis. Dec. 15, i960. (Publ. 4426.) 



(v) 



