Abstract
1) The falciform process, vitreal vessels and other related structures of the teleost eye were observed under a binocular microscope, and in some cases these observations were accompanied by the indirect methode of ophthalmoscopy, on 266 species belonging 128 families; the interrelationship among these structures was discussed from the standpoint of vascularization.
2) The falciform process consists chiefly of the vascularization springing from the main vessel of the hyaloid artery into the vitreous cavity rather than the outgrowth of choroidal connective tissue through the persisting embryonic fissure. The various instances of the falciform process have been divided into four successive types on the basis of vascularization.
3) The falciform process and some instances of vitreal vessels are related by a type of falciform process with branches on the retina. This means that vitreal vessels in general may have the branches from the main vessel developed extensively over the retina.
4) The interrelationship between these structures, including the retinal vessels and other unusual instances, has been tentatively summarized in Fig. 7, the possibilities of the healing of the embryonic fissure and the degeneration of vascularization having been assumed.
5) Further, a marked correlation between the extreme types of these structures and the swimming habits of the fish was mentioned.
