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GlARD, A. 



1903. Caracteres dommants transitoires chez certains hybrides. C. R. Seances et Mem. 



Soc. de Biol, annee 1903, vol. 55, pp. 410-413. 

 GUTEE, M. F. 



1909. Atavism in guinea-chicken hybrids. Journ. Exper. Zool., vol. 7, pp. 723-745. 

 GULICK, J. T. 



1905. Evolution, racial and habitudinal. Publ. No. 25, Carnegie Inst. Washington. 

 Haldeman, S. S. 



1841. Observations on the Melanians of Lamarck. Amer. Journ. Sci. Arts., vol. 41, pp. 

 21-23. 

 Hardy, G. H. 



1908. Mendelian proportions in a mixed population. Science, n. s., vol. 28, pp. 49-50. 



HiLGENDORF, H. 



1866. Planorbis multiformis im Steinheimer Stisswasserkalk. Monatsber. Kon. Preuss. 

 Akad. Wiss. Berlin, pp." 474-504. 



1901. Der Ubergang von Planorbis multiformis trochiformis zum PI. mul. oxystomus. 



Arch. Nat. 1901, 67 Jahrg. Suppl., pp. 331-346. 

 Holmes, S. J. 



1909. The categories of variation. Amer. Nat., vol. 43, pp. 257-285. 

 Hyatt, A. 



1880. The genesis of the tertiary species of Planorbis at Steinheim. Mem. Boston Soc. 



Nat. Hist. Fiftieth Anniversary, pp. 1-114. 

 1898. Evolution and migration of Hawaiian land shells. Science, n. s., vol. 8, p. 395. 

 Johnson, R. H. 



1908. Determinate evolution in the color pattern of the Lady Beetles. Publ. No. 122. 

 Carnegie Inst. Washington. 

 Lang, A. 



1904. tJber Vorversuche zu Untersuchungen uber die Varietatenbildung von Helix Tior- 



tensis Miiller and Helix nemoralis L. Festschrift zum siebzigsten Geburtstage von 

 Ernst Haeckel. Jena. 



1906. Uber die Mendelschen Gesetze, Art und Varietatenbildung, Mutation und Variation, 



insbesondere bei unseren Hain- und Gartenschnecken. Verb. Schweizerischen 



Naturforch. Gesell. Luzern. 88 Jahresversm., pp. 209-254. 

 1896. Kleine biologische Beobachtungen iiber die Weinbergschnecke (Helix pomatia L.). 



Vierteljahrsschr. Naturforcsh. Gesell. Zurich. 41 Jahrg. Teil 2, pp. 488-495. 

 1908. Uber die Bastarde von Helix hortensis Miiller und Helix nemoralis L., Jena, pp. 



120. 

 Lewis, James. 



1871. On the shells of the Holston River. Amer. Journ. Conch., vol. 6, pp. 216-226. 

 1876. lo and its habits. Amer. Nat., vol. 10, pp. 321-335. 

 MacDougal, D. T. 



1907. Hybridization of wild plants. Bot. Gaz., vol. 43, pp. 45-58. 

 Mayer, A. G. 



1902. Some species of Partula from Tahiti. A study in variation. Mem. Mus. Comp. 



Zool., vol. 26, no. 2, pp. 117-135. 



MOLLENDORFF, O. VON. 



1873. Beitrage zur Favma Bosniens. GorHtz, H. Tzschaschel, pp. 73. 

 MooRE, J. S. E. 



1903. The Tanganyika problem. London, pp. 371. 

 Newman, H. H. 



1908. The process of heredity as exhibited by the development of Fundulus Hybrids. 



Journ. Exper. Zool., vol. 5, pp. 503-561. 



