Abstract

One of the most remarkable structures found in the skull of certain Amniota or higher Vertebrata—Reptiles and Mammals, is the so-called “Jacobson’s organ.” A pair of these curious gland-like bodies, each carefully placed in its own special capsule, may be seen in Serpents, Lizards, and Mammals; but they are not present in Tortoises, Crocodiles or Birds, as far as our present knowledge goes. Rathke, in his work on the Snake’s Skull, spoke of the “nasal glands and their capsules,” and for a long while this term made them to be confused with the nasal glands of birds, which have nothing whatever to do with “Jacobson’s organs.”

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