EXPLANATION OF FIGURES iii 



PLATE VII 

 Fig. 45. Supra-sternal notch, normal, broad, and shallow. 



Fig- 46- „ „ » >, ,, 



Fig. 47. „ „ „ deep, and narrow. 



Fig. 48. Male sternum {aet. nine years). Supra-sternal border raised into a median pro- 

 jection. 



Fig. 49. Male sternum {aei. forty-six years). Supra-sternal border raised into a median 

 projection. 



Fig. 50. Example of supra-sternal ossicles. 



Fig. 51. Supra-sternal ossicles (from behind). A fused ossicle on the left side ; a raised 

 articular facet on the right side. 



Figs. 52, 53. Examples of two fused tubercles on the supra-sternal border. 



Fig. 54. Example of tubercles on the supra-sternal border, with articular facets. 



Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 



Fig. 60 



Fig. 61. 



Fig. 62. 

 Fig. 63. 

 Fig. 64. 



Fig. 65. 



Fig, 66. 



Fig. 67. 



Fig. 68. 



Fig. 69. 



PLATE VIII 



Scheme of the homologies of the shoulder-girdle and sternum. 



Sternum of a male {ae(. thirty-five), with sternal foramina (half natural size). 



The shoulder-girdle and sternum of the frog {Rana temporarid), from Parker. 



The sternum of Chirotes canalkulatus, from Parker ( x 9). 



Sternum and shoulder-girdle oi Letnanctus hngipes, from Parker. 



„ „ ,, the Crocodile (young), from Parker. 



PLATE IX 



Scheme of prevalent variations of the sternum, affecting (i) clavicular facets ; 

 (ii) pre-mesosternal junction ; (iii) thickness of first costal cartilage ; (iv) dis- 

 placement downwards of left cartilages (2-7) ; (v) detachment of left seventh 

 costal cartilage ; (vi) attachment of right eighth costal cartilage ; (vii) sternal 

 foramen; and (viii) bifurcation of metasternum. 



Presternum of chamois (natural size). 



Sternum of ant-eater {Myi-mecophaga jubata) (two-thirds natural size). 



„ jacical (two-thirds natural size). 



PLATE X 



Shoulder-girdle, etc., of Anguis fragilis ( x 6), from Parker. 

 Presternum and supra-sternal ossicles in Mus musculus, from Parker. 

 Sternum oi Manatee (one-quarter natural size). 

 Sternum, etc., of Echidna. 



„ „ Omithorhynchus. 



