■■i -«.— Mniuli:,]ej of Nautilii 



BJSO.—Wi.le-moulhed Bellerophon. 



853I._Sli(.ll of Argonaut, 



Si-iaa. - Sliell ,.lT.i!'fr,-,.i,)ui Arsoimut. 



252T.— Strncture of NautUui. 



181 



