. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 107. -Vas. Text-figure 70. cases for mammals (roebuck and goat) and 5 for man as verj' probable. To these Pick adds a later case by Uffreduzzi (1910) and one by Gudernatsch (1911). The 5 cases found in swine by Pick are of unusual interest. The external genitalia were entirely-female or nearly so. Within the abdomen were uterus and fallopian tubes (text-fig. 70). In four of the cases an ovotestis was present on each side in the normal position of the ovary.
. Contributions to the genetics of Drosophila melanogaster. Drosophila melanogaster; Heredity; Karyokinesis. THE ORIGIN OF GYNANDROMORPHS. 107. -Vas. Text-figure 70. cases for mammals (roebuck and goat) and 5 for man as verj' probable. To these Pick adds a later case by Uffreduzzi (1910) and one by Gudernatsch (1911). The 5 cases found in swine by Pick are of unusual interest. The external genitalia were entirely-female or nearly so. Within the abdomen were uterus and fallopian tubes (text-fig. 70). In four of the cases an ovotestis was present on each side in the normal position of the ovary. In the fifth case an ovary with a small piece of testis was on one side and a testis on the other. The conditions here suggest at least that the results are not due to chromosomal elimination, al- though such an interpretation might be given. If, for instance, the gonads arise at an early stage froma single cell in which an anterio-posterior division occurred and the later mass of cells was subsequently separated into right and left parts, the condi- tions found might be realized. There is, however, a possibility that here, as in cattle, a \mion between the chorions of the embr\'o in the uterus might have brought about a more perfect freemartin than develops in cattle when such a union occurs. (See Lillie.) Ritter described a pig in which on the right side a testis was present and on the left an ovary. (Verh. phys. Med. Gesell. Wiirzburg, XIX, 1886). Harman more recently (1917) describes a cat with a testis on one side and an ovary on the other. Neurgebauer has given a large number of cases in man in w^hich testes and ovaries have been described in the same individual and in which the genitalia show many anomalous relations. Amongst the large number of human hermaph- rodites described there are probably a considerable number of authentic cases where parts of both male and female genitalia were combined in the same individual, but writing as late as 1911, Guder- natsch states t
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