References 361 



Littlejohn, M. J. 1959. Call differentiation in a complex of seven species 

 of Crinia (Anura, Leptodactylidae ) . Evolution 13:452-468. 



Lobeck, A. K. 1939. Geomorphology. McGraw-Hill Book Co., Inc., New 

 York. 



Love, A., and Doris Love. 1953. Studies on Bryoxiphium. The Bryologist 

 56:73-94, 183-203. 



Love, J. D. 1939. Geology along the south margin of the Absaroka range. 

 Geol. Soc. Amer., Special Paper 20:116-117. 



Lowenstam, H. A., and S. Epstein. 1954. Paleotemperatures of the Post- 

 Aptian Cretaceous as determined by the oxygen isotope method. J. 

 Geol. 62:207-248. 



McCabe, T. T., and I. M. Cowan. 1945. Peromyscus maniculatus mac- 

 rorhinus and the problem of insularity. Royal Can. Instit. Trans. 

 1945:117-215. 



MacGinitie, H. D. 1953. Fossil plants of the Florissant beds, Colorado. 

 Carnegie Inst. Wash. Publ. 599. 



Mcintosh, R. P. 1958. Plant communities. Science 128:115-120. 



MacLulick, D. A. 1937. Fluctuations in the numbers of the varying hare 

 (Lepus americanus) . Univ. Toronto Studies, Biol Ser. 43. 



Mahler, H. R., H. M. Baum, and Georg Hiibscher. 1956. Enzymatic 

 oxidation of urate. Science 124:705-708. 



Manton, Irene. 1950. Problems of cytology and evolution in the Pteri- 

 dophyta. Cambridge University Press, Cambridge, England. 



Marlatt, C. L. 1907. The periodical Cicada. U. S. D. A. Bur. Ent. Bull. 71. 



Mattfeld, J. 1930. Uber hybridogene Sippen der Tannen. Bibliotheca 

 Botanica 25 (100): 1-84. 



Mattingly, P. F. 1953. Species hybridization in culicine mosquitoes. Royal 

 Ent. Soc. London Proc, Ser. C, 18:41-42. 



Mayr, E. 1942. Systematics and the origin of species. Columbia Univ. 

 Press, New York. 



. 1947. Ecological factors in speciation. Evolution 1:263-288. 



Mazia, D. 1956. The life history of the cell. Amer. Scient. 44:1-32. 



Menard, H. W. 1960. The East Pacific rise. Science 132:1737-1746. 



Michener, C. D. 1944. Comparative external morphology, phylogeny, and 

 a classification of the bees (Hymenoptera). Amer. Mus. Nat. Hist. 

 Bull. 82:151-326. 



