NEAL, — Nervous Syst. Squalus. 
PLATE 1, 
All figures magnified 48 diameters, and oriented on the plate with the chief axis 
horizontal, the anterior end of the embryo to the right. The embryo made trans- 
lucent was drawn in outline with camera lucida and afterwards studied as an 
opaque object. 
Fig. 1. A dorsal view of an embryo with 6 to 64 somites. The edges of the neu- 
ral plate are seen to be irregularly lobed. The two deep depressions at 
the anterior end of the cephalic plate mark the position of the future 
fundus of the infundibulum. 
Fig. 2. A ventral view of the same embryo. Locy’s segments are seen as lobings 
of the ventrally recurved margin of the neural plate. 
Fig. 3. A ventral view of another embryo of the same stage of development. The 
specimen was dissected to show the chorda, a rod in the median axial 
line, on either side of which lie the somites, van Wijhe's seventh somite 
being designated as 7. An asterisk (*) marks the posterior boundary of 
the cephalic plate. 
