158 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



APPENDIX G. 



APPENDIX H. 



Correlation Surface : Rays and 

 A.-p. Diameter. 



Irish Sea, Lower Valve. 



Correlation Surface : Rays and 

 Transverse Diameter. 



Irish Sea, Lower Valve. 



No. of Rays, M — 18.101 ± .029 ; a — 1.072 ± .021. 



