Heredity, Variation and the Results of Selection in the Uniparental Reproduction of DIFFLUGIA CORONA.

POPULATIONS ........................................... ...... 419 Constitution; variation ; correlation of characters. . . . . . . . . . . . . . . . . . . . 419 Distribution of the variations.. .................................... 423 Number of spines, p. 424; diameter of the shell, p. 4 2 5 ; depth of the shell, p. 426; diameter of the mouth, p. 427; number of teeth, p. 427; length of the longest spine, p. 428. Correlation between the different characters of the individuals.. .... 428 Inheritance in populations 429 Statistical study of inheritance in populations. 430 Existence of diverse strains.. 437 Distribution and variation of characters within single families.. ......... -14-t Correlation of the characters of the individuals within single families.. . 450 What hereditary combinations of characters may occur in diverse families ? 4 52 Diameter and number of spines, p. 453; diameter and number of teeth, p. 456; diameter and length of spines, p. 456; combinntions of other characters, p. 459. Correlation of diverse characters in populations composed of different