266 Mammalia, 



cle) are blended : there may also be seen prominent festoon- 

 like processes of the fibres of tbe Iris lying in a transparent, 

 elastic, fibrous tissue continuous with the posterior elastic 

 layer of the Cornea, and giving a milled appearance like that 

 of the edge of a coin ; this constitutes the Ligamentum pecti- 

 natum : and, lastly, the finely indented border, ora serrata, 

 which forms the anterior boundary of the nervous tunic or 

 Retina, extending forwards nearly to the outer edge of the 

 Ciliary processes of the Choroid, whence nucleated, elongated 

 cells (not nerve elements), constituting the pars cilia ris retina, 

 are continued onwards as far as the tips of the Ciliary processes. 

 The anterior face of the eye after the performance of the 

 various sections above described (viz.: 1. Removal of Cornea, 

 2. Heflection of Sclerotic, and 3. Reflection of Circle contained 

 within Ciliary Ring) now presents to our view() a transparent, 

 though firm and elastic Capsule encompassing the Lens ; (b) 

 a transparent membranous structure placed around the Lens, 

 termed the Suspensory ligament, or Zonule of Zinn, on which 

 dark lines of pigment covering the surface may be traced, 

 which when washed, reveal plaits or folds less prominent but 

 longer than the processes of the Choroid coat which have 

 been just removed therefrom (these two sets of folds having 

 been dovetailed together, the prominence of one membrane 

 being received into the hollow of the others) ; (<?) the fine 

 transparent Hyaloid membrane which encapsulates the Vitreous 

 Humor, and is at its fore part closely united with the posterior 

 aspect of the suspensory ligament of the Lens, which however 

 it underlies, and, passing beyond, ends by joining the back of 

 the capsule of the Lens : {d) the cut edges of the Retina and 

 of the Choroid coats. It will be apparent from the above 

 description that it is possible for an interval to exist, surround- 

 ing the edge of the Lens capsule, bounded in front by the 

 suspensory ligament, and behind by the hyaloid membrane (in 

 that it passes posteriorly to the suspensory ligament, though 



