DICHOTOMY. TLE 
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 :— 
Fic. 58.—The Mud-fish (Protoplterus 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). 
Fic. 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 
