M? Rotate & Erstaie.LltH? Edit!* 
1-9 POLYCERA. 10-16 TETHYS. 
Lankester 
Phil. Trans. 1875 . Plate 10 . 
Kg. 10. 
Oo 
O 
o 
< 
/ ovv, 
/ cTl 
mo 
Vo 
X°/oj 0 
\Y / 
