7X 



BIBLIOGRAPHY 



The literature in this field is so extensive, the following list 

 represents a much abbreviated summary of the sources of 

 information on the subject. 



Agersborg, H. P.K. 1929. Factors in the evolution of the pro- 



sobranchiate mollusc, Thais lapillus. Nautilus, 43: 45-49« 

 Allee E. P. et al. 1949. Principles of animal ecology. 



Allen, J. F. 1954. Stability in taxonomy. Syst. Zool., 3: 140- 

 142. 



Babcock, E. B. and H. M. Hall. 1924. Hemizonia congesta, 

 a genetic and taxonomic study of the hay-field tar-weeds. 

 Univ. Cal. Publ. Bot., 13: 15-100 



Burch, J. Q. 1945. Synopses of the Mollusca. Tbaisidae. Min- 

 utes, Conch. Club S, Cal., 52: 3-6. 



Burt, W. H. 1954. The subspecies category in mammals. Syst. 



Zool., 3: 99-104. 

 Carlisle, D. B. I955. Local variation in the color pattern of 



the prawn {Leander serratus). Jour. Mar. bioi. Ass. U. K., 



34: 559-563. 

 Charlesworth, J. R. 1957. The Quaternary Era., 1-1700. 

 Chace, E. P. 1952. Discussion of the shells of the genus Po/y- 



tropa Swainson (1840). Min. Conch. Club S. Cal., 124: lo-ii. 

 Qark, R. B. 1956. Species and systematics. Syst. Zool., 5;i-io. 

 Clench, W. J. 1947. The genera Purpura and Thais in the -^ 



western Atlantic. Jonsonia, 2:62-92. 



1954. The occurrence of clines in molluscan populations. 



Syst. Zool., 3: 122-125. 

 Colton. H. S. 1916. On some varieties of Thais lapillus in the i^ 



Mount Desert region. A study of individual ecology. Proc.' 



Acad. Nat. Sci. Phil., 68: 440-454. 



1922. Variation in the dog-whelk, Thais (Purpura auct.) ^ 

 <fl/>t7/«x. Ecology, 3: 146-157. - ^ , . _ 



