26 
The Embryology of Patella. 
Plate IV. 
Fig. 45. Embryo of 65 bours, seen from the ventral surface. 
Eig. 46. Embryo of 55 hours, seen from the dorsal surface. 
Fig. 47. Embryo of 55 hours, seen from the side. 
Fig. 48. Embryo of 65 hours, seen from the side. 
Fig. 49. Lateral section of an embryo of 45 hours, showing the first division 
of the primitive mesoblasts. 
Fig. 50. Similar section of an embryo of 50 hours, showing the development 
of the mesoblastic chords. 
Fig. 51. Similar section of an embryo of 58 hours showing the further deve¬ 
lopment of the mesoblastic chords. 
Fig. 52. Lateral section of an embryo of 65 hours showing the disintegration 
of the apical ends of the mesoblastic chords. 
Fig. 53—55. Three consecntive cross sections of an embryo of 50 hours, 
through the region of the mooth, showing the invagination of the auditory Organs. 
Fig. 56. Tangential section through au embryo of 40 hours showing arrange- 
ment of cells around the blastopore. 
Plate V. 
Fig. 57- Side view of an embryo 80 hours old. 
Fig. 58. Side view of an embryo 100 hours old. 
Fig. 59. Diagonal section through an embryo of 50 hours. 
Fig. 60. Cross section through the median row of velum cells of an embryo 
90 hours old. 
Fig. 61. Cross section through the velum of an embryo of 100 hours. 
Fig. 62. Median longitudinal section through an embryo of the same age as 
Fig. 61. 
Fig. 63. Tangential section through the ventral surface of an embryo 
80 hours old. 
Fig. 64. Median longitudinal sectiou of an embryo of 70 hours. 
Fig. 65. Median longitudinal section of an embryo of 98 hours. 
Fig. 56. Side view of an embryo of 130 hours. 
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