1893.] Zoology. 157 
hexadactyle limb met with in the Amniota, as well as the pentadactyle 
pes of the Dorking fowl, is a monstrous formation, and that arguments 
deduced from their study in support of hexa- and heptadactyle limbs 
are premature. The author calls attention to the fact that inasmuch 
as no observed amphibian either living or extinct is known to have 
borne more than two phalanges upon its second digit, neither the sau- 
-ropsidian nor the mammalian types can be derived from that of the 
Amphibia except by a process of intercalation such as there is no evi- 
dence to support. As involving the Mammalia, the force of the argu- 
ment against a belief in the amphibian origin of the class it is second 
only to that of the discovery of the mammalian condition of the 
limbs in the Theromorous Reptiles—Jour. Anat. and Phys., Vol. 
XXvi. 
