DEVELOPMENT OF THE SKULL IN THE BATRACHIA. 
667 
Bufo vulgaris. — Adult. 
Fig. 3. Endocranium, seen from above. X 4 diameters. 
Fig. 4. The same, lower view. X 4 diameters. 
Fig. 5. Part of the same cranium, seen from the front, x 4 diameters. 
Fig. 6. Part of the facial region (ectocranium), with labial ; side view. X 8 diameters. 
Fig. 7. Auditory region of skull, with upper edge partly pared away, x 4 diameters. 
Fig. 8. Columella and stapes from the same ; inner view. X 8 diameters. 
PLATE 55. 
Bufo vulgaris. — Tadpoles and young. 
Fig. 1. Chondrocranium of a Tadpole, 4 lines long; 1st stage; upper view. X40 dia- 
meters. 
Fig. 2. The same, side view. X 40 diameters. 
Fig. 3. Chondrocranium of a Tadpole, 5f lines long ; 3rd stage ; upper view, x 35 
diameters. 
Fig. 4. Chondrocranium of a Tadpole, 5 lines long ; 2nd stage ; half of lower view. 
X 35 diameters. 
Fig. 5. Chondrocranium of a Tadpole, 8 lines long ; 4th stage ; part of lower view. 
X20 diameters. 
Fig. 5“. Part of same region of fenestra ovalis. X 200 diameters. 
Fig. 6. Chondrocranium of young Toad, 5 lines long ; 5th stage ; part of inner view. 
X 15 diameters. 
Fig. 7. Part of the same. X 45 diameters. 
Fig. 8. A view, like fig. 6, of a young Toad, 8 lines long, x 15 diameters. 
PLATE 56. 
Dactylethra capensis. — Youngest Tadpole , whose total length was 14 inch. 
Fig. 1. Upper view of Tadpole; 1st stage. x4 diameters. 
Fig. 2. Lower view of Tadpole. X 4 diameters. 
Fig. 3. Side view of Tadpole. X 4 diameters. 
Fig. 4. Chondrocranium of same, upper view. X 10 diameters. 
Fig. 5. The same, lower view. X 10 diameters. 
Fig. 6. Mandibles and hyoid cartilages of the same. X 10 diameters. 
PLATE 57. 
Dactylethra capensis.- — Tadpoles If inch long. 
Fig. 1. Chondrocranium of Tadpole, upper view, 2nd stage. X 6 diameters. 
Fig. 2. The same skull, seen from below. X 6 diameters. 
4 z 2 
