PLATE 15 



EXPLANATION OF FIGURES 



31 Dog, 14 mm. H. E. C, sagittal series, no. 2052. X 20. 



32 Dog, 17 mm. H. E. C, sagittal series, no. 2053. X 20. 



33 Cat, 10.7 mm. H. E. C, sagittal series, no. 475. X 20. 



132 



