DICHOTOMY. IT i 



Excess in the number of the limbs may occur with the 

 fore-limbs. The museum of the Royal College of Sur- 

 geons possesses a specimen of a frog, thus described in 

 the catalogue : 



FIG. 58. The Mud-fish (Protopterus annectans], 

 with partial dichotomy of the right pectoral 

 limb. (After Albrecht.) 



" A frog with a small additional anterior extremity 

 springing from the posterior and lateral part of the 

 sternum " (Hunterian). 



FIG. 59. A Toad (Bufo vulgaris juv.), with 

 supernumerary hind limb. 



A specimen which came under my observation is 

 sketched in fig. 60. The limb furnished with four 

 digits was attached to the anterior part of the left 

 moiety of the shoulder girdle through the intervention 



