492 



MISS JOAN B. PROCTER ON THE 



two have extiaordinaiy embossed vertebrals ; three individuals 

 possess an intergular. Mr. Loveridge mentions two specimens, 

 which unfortunately escaped, in which small azygous shields 

 occur, also several in which the supracaudal is single or semi- 

 divided. 



Each shield is also subject to considerable individual variation 

 of size and shape. 



Text-fisfure 4. 



Sketch of carapace of male type-specimen, showing abnormalities 

 in epidermal shields (f nat. size). 



The shield surfaces in the young are excessively rugose or 

 coarsely granulated, each one bordered narrowly by a raised band 

 of smooth horn; with age these rugosities wear smooth, but the 

 ensuing growth-rings, also of smooth horn, are extremely regular, 



