HUBRECHT. 
amn 
Pl. S. 
96a 96b 
Fig. 93 to 96. Four surface-views of 
the embryonic shield of Tarsius. In Fig. 93 
the median concrescence of protochordal wedge 
and protochordal plate has come about and 
notogenesis has commenced; in Fig. 94 and 95 
the region of the dorsal mouth (primitive streak) 
has become elongated simultaneously with the 
