188 On Abnormal Legs in Frogs. 
School), which I have never previously met with during 
twenty years’ experience of numberless frogs. In each case 
it is the left leg that is affected. 
Fig, 2. 
10. 
O. 
cm. 
R, right (normal) leg ; L, left (abnormal) leg from the same specimen, 
from the dorsal aspect. /., femur; ¢-/., tibio-fibula; A., astra- 
ealus; C.,caleaneum ; 7., tarsus; d.¢., distal tarsals ; M?¢., meta- 
tarsals; Ph., phalanges. 
The abnormalities take the following form :— 
(1) Suppression of the first digit. 
(2) Variation in the number of phalanges, 
(3) Abortion of the astragalus and calcaneum. 
(4) Entire fusion of the tarsus. 
The first peculiarity is without exception. 
