fuscin

from The Collaborative International Dictionary of English v.0.48

Fuscin \Fus"cin\, n. [L. fuscus dark-colored, tawny.] (Physiol.
   Chem.)
   A brown, nitrogenous pigment contained in the retinal
   epithelium; a variety of melanin.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Melanin \Mel"a*nin\, n. [Gr. me`las, me`lanos, black.]
   (Physiol.)
   A black pigment found in the pigment-bearing cells of the
   skin (particularly in the skin of the negro), in the
   epithelial cells of the external layer of the retina (then
   called {fuscin}), in the outer layer of the choroid, and
   elsewhere. It is supposed to be derived from the
   decomposition of hemoglobin.
   [1913 Webster]