PLATE 36. 



Illustrative of Dr. Kelly's Paper "O^r a Case oe Polydactylism." 

 Vide Proceedings R. I. Acad., Yol. 2, Ser. 2, p. 539. 



Fig. 1. I., II., III., lY., Y., YI. The metacarpal bones. 



P. I., P. II., P. III. Pii'st, second, and third PolUces. 



a, Posterior angle of Os Triqnetrum. 



i, Interosseous ligament, corresponding with the line of junc- 

 tion of the " Complemental process," with the Scaphoid 

 in the left hand (fig. 2, h). 



c, Line of fusion between the Posterior Trapezoid and the 



Complemental process. 



d, The depression indicating the tendency to bifidity in the 



second metacarpal bone. 

 Pig. 2. P. I., P. II., P. III. Pirst, second, and thiixl PoUices. 

 a, Posterior angle of Os Triquetrum. 



I, Line of union between the Scaphoid and the " Complemen- 

 tal process." 



c, The cartilaginous ferule on apex of the metacarpal bone of 



first Pollex. 



d, Sesamoid bones. 



e, The united second and third phalanges of third Pollex. 

 Pig. 3. a, Anterior Trapezoid. 



I, Broken line indicating the position of the Os Triquetrum. 

 Pig. 4. The Os Triquetrum of right hand. 



Pig. 5. The two bones in the left hand corresponding with the Os 

 Triquetrum of the right hand. 



a, The detached unciform process. 



