Plate 2 
Ferrier and Yeo. 
Phil. Trans. 1884 . 
Fig. 53 
Fig. 55 
Fig. 54 
Fig. 52 
Fig. 57 
» 
Protoor.rheo .ho Printed the Photomech.-icee P„ht,.o Co.r.r, l.h.ocne r»o. Totten,,. 
Fig. 59 
