Then comes the biconvex crystalline lens L, an elastic gelatinous-looking solid, which is easily distorted by pressure.

The first differs from all the other vertebrae of the body in having a biconvex centrum.

Grain is narrow, obovoid, biconvex, with two grooves on the anterior side and with a long embryo.

Where two toes overlap, it will be observed that there is a deeper shadow, like the section of a biconvex lens.

Although the common liver fluke is flat, many species of the order are round, biconvex, or even filiform organisms.

The atlas (fig. 71) is remarkable, consisting of four pieces, and the first caudal is biconvex.

The first caudal vertebra of modern Crocodilia is biconvex, and in the Chelonia all types of vertebral centra are found.

The coloured corpuscles of amphibia as well as of nearly all vertebrates below mammals are biconvex and elliptical.

The lens is biconvex in diurnal mammals, but in nocturnal and aquatic it is spherical.

The holochroal eyes are of two kinds, one with plano-convex and one with biconvex lenses.