. Elementary biology; an introduction to the science of life . Fig. 9S. The third eyelid The little fold of tissue extending from the inner corner of the eye corresponds to the third eyeUd, or iiictitathig mcni- b7'an€, in birds and certain reptiles and amphibians. The nictitating membrane can be drawn over the eye so as to cover it completely, a, eye of ape : /;, eye of owl; r, human eve : i\, the semilunar fold, eyeball removed

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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology