Abstract

THE Syrian hamster, Mesocricetus auratus, introduced to the laboratory by Adler and Theodor1 in 1931, is a golden-brown rodent with pale cream belly fur and two characteristic throat flashes. Melanic pigment darkens the skin of the ears and is present about the genitals in both sexes (in the region of the vulva and anus in females, and in the scrotum and spots on the prepuce in males). It is to be expected, as increasing numbers of hamsters are bred, that mutant types will appear. This note records the occurrence of two new mutations.

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