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MR. W. K. PARKER ON THE SKULL IN SHARKS AND SKATES. 
PLATE XXXIX,. 
. Skate. Hirst stage. Side view of embryo of Raia maculata, 1 inch 4 lines 
long, 7 weeks old, from the deposit of the egg-pouch, X 14 diam. 
. Same object, with facial arches shown, x 14 diam. 
Part of same, X 20 diam. 
. Under view of same embryo, x 14 diam. 
. Upper view of same, x 14 diam. 
. Part of fig. 5, Plate XXXV., Scyllium, x 40 diam. 
PLATE XL. 
. Second stage. Under view of fore part of an embryo of Raia maculata, 
3 months from deposit of egg-pouch, x 34 diam. 
. Upper view of-same, x 33 diam. 
. Side view of same, X 7 diam. 
. Skull of same, seen from above, x 5 diam. 
. Same object, seen from below, x 5 diam. 
. Cranium of same, from below, x 5 diam. 
. Part of fig. 38, Plate XXXV. x 40 diam. 
PLATE XLI. 
. Third stage. Section of cranium of Faia clavata (nearly ripe embryo), 
x 7 diam. 
. Transverse section of same through nasal sacs, X 14 diam. 
. Fourth stage. Skull of adult Raia clavata, from above, x 14 diam. 
. The same, side view, X 13 diam. 
. Hyoid arch, with “ branchial rays” of same, inner view, X 14 diam. 
PLATE XLII. 
. Third stage, continued. Section through antorbital region of ripe embryo of 
Raia clavata, X 14 diam. 
. A similar section of same, through the eyes, x 14 diam. 
. Another section through auditory sacs, x 14 diam. 
. Fourth stage continued. Under view of skull of adult Raia clavata, x 1} diam. 
. Transverse section of skull of Dog-fish, 5rd stage, through the eyeballs, x 14 diam. 
. Another section, rather oblique, in postorbital region, x 14 diam. 
. A third section, through the auditory capsule, x 14 diam. 

