being in this respect more peifect than the human, "and I.e 
went on to explain the structure of the Crystalline lens, 
which, in the Loligo, was composed of a spherical lens, and 
two menisci (a combination used by opticians for certain 
purposes), but which generally resembled the Coddington 
lens, a sphere with a groove cut in it, or more strictly, two 
plano-convex lenses placed together, the groove being filhd 
up and surrounded with an apparatus of tendons, ciliaiy 
muscle, &c., the purpose of which was to alter the position 
of the lenses relatively to the posterior surface of the eye, 
and thus enable it to perceive objects at different distances 
distinctly, though not simultaneously, 
Mr. Leipner exhibited a specimen of an ordinary rat, 
recently captured by Mr Charbonnier, in which, probably 
from a blow in infancy, the incisor teeth had grown in a 
most abnormal manner, twisting about and re-entering the 
palate in such a way as entirely to prevent the unimal 
from eating, which must therefore have lived by suction. 
WM. LANT CARPENTER, 
Honorary Reporting Secretary. 
