. The life-history of British lizards and their local distribution in the British Isles. COMMON LIZARD (fEMALE).. LIZARD ( ALVLKj. IPacingp. 49. THE COMMON LIZARD, LAGERTA VIVIPARA 49 lizards there are no glands in the skin, unless thefemoral and pre-anal pores which occur in this andmany other species are to be regarded as pores are found on the under-surface of thethighs, particularly in the males, and also in front ofthe anal opening. Those on the thigh of the commonHzard number from nine to twelve. Each of theseorgans perforates a scale and leads into a tubularinvagin
. The life-history of British lizards and their local distribution in the British Isles. COMMON LIZARD (fEMALE).. LIZARD ( ALVLKj. IPacingp. 49. THE COMMON LIZARD, LAGERTA VIVIPARA 49 lizards there are no glands in the skin, unless thefemoral and pre-anal pores which occur in this andmany other species are to be regarded as pores are found on the under-surface of thethighs, particularly in the males, and also in front ofthe anal opening. Those on the thigh of the commonHzard number from nine to twelve. Each of theseorgans perforates a scale and leads into a tubularinvagination, which is lined with epidermal cells, theproliferation of which produces a horny yellowishdebris, and this fills the- tube and appears above thesurface in the shape of a little cone. ^ The functionof this excretion is not definitely ascertained, butpossibly it is concerned in gratifying some sense-perception. Professor Cope remarks upon this : Theuse of this substance is uncertain, but it is probablyan important aid to the animal in maintaining itshold on smooth surfaces. Lizards which move onthe groun
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