HUBRECHT. Pi: 
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Wig ee 
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ase ts Meelis ! 
aie pata ni 
8S 
Fig. 87. Longitudinal section through on early embryo of Amia (after 
Bashford Dean, 96). This stage is comparable to that of Rana (Fig. 80) and 
of Hypogeophis (Fig. 85); 2% protochordal plate. cz notochord, vz ventral meso- 
blast, aZ portion of intestine comparable with allantois region of higher verte- 
brates. — Fig. 88. Longitudinal section of early muraenoid embryo (after Boeke, 
03). pp protochordal plate, pw protochordal wedge, fv proliferation homolo- 
gous to the ventral mesoblast. — Fig. 89. A section of the hinder portion of an 
older muraenoid blastodisk. vz ventral mesoblast. 47 Kupffer’s vesicle; ch 
notochord (after Boeke, 03). — Fig. 90. Longitudinal section of the hinder part of 
a Salmonid embryo with Kupffer’s vesicle (after Ziegler, 02). — Fig. 91 and 
92. Two sections through the anterior part of two different blastodisks of the dog 
(after Bonnet, ‘01).. The protochordal plate (Af) is proliferating in both of them. 
