PI. IX. 



C.Stewa.rt del. 



CARTILAGE X30O. 



i .SPIROORAPHI s. hrcuwhial 2.HALIOT \s.buccal. 

 S.SEPI A (gold prep ./ ] cepkabiu *. SEPIA . equalvricd' . 

 S.PETROMYZON . crccrdaZ s. PETROM YZON . nctcchcrd 



