1871.) Proceedings of the Asiatic Society. 19 
characters,’ and those that took the form of the re-development of 
visible rudiments of digits, or other structures, normally present 
in some remote ancestors of the group to which the individual 
affected belonged. This explanation applied to the polydactyle 
foot figured on the accompanying plate (I.). The resemblance to the 
extinct Wipparion* would have been perfect if the two outer toes 
on each foot had been developed, In illustration of these remarks, 
he traced the Horses back in time to their three-toed progenitors, 
Hipparion and Anchitherium, whose remains abounded in the miocene 
deposits of Europe, India (in the Sewalik-hills), and America : in Hip- 
parion the two outer toes of each foot possessed the same number 
of phalanges as the principal toe, but were reduced to mere dewclaws 
and did not touch the ground ; in Anchitherium, on the the other hand, 
they were nearly equal in sizo to it. The figures sufficiently show- 
ed the great length and breadth of the “ splints” (ii. et iv. in figs. 
1 et 2), and the obtuseness of their distal extremities as compared 
with the slender, finely pointed character of these same structures 
in an ordinary horse. 
Explanation of Plate I, 
Fig. 1, Front view of right carpus (minus the proximal series of carpal bones) 
of a polydactyle horse ; } nat. size. 
Vig 2. Posterior view of same. 
The Roman numerals ii, iii, iv refer to the 2nd, 3rd and 4th digits respec- 
tively in both figures, 
The following papers were received. 
On terrestrial Mollusca from the neighbourhood of Moulmein, 
Tenasserim Provinces, by Dr. F. Stoliczka. 
Monograph of the Indian Cyprinide, Pt. I, by Dr. F. Day. 
LIBRARY. 
The following additions have been made to the Library since the 
meeting held in December last. 
Presentations. 
*,* Names of Donors in Capitals. 
Proceedings of the Royal Institution of Great Britain, Vol. V. 
Part VII.—Tue Iysrirvrion. 
Journal of the Chemical Society, Sept., 1870.—Tue Soctery. 
* Vide the magnificent memoirs of M. Gandry and Dr. Leidy, and in con- 
nexion therewith Prof. Huxley’s Presidential address to the Geological Society 
of London, February, 1870. 
