ArtificiaUy Produced Cyclopean Fish 



3^S 



the normal condition and finally beyond to the incomplete dipro- 

 sopus with three eyes and a fourth lens. The idea of arranging 

 monsters in such a series including the normal is due to Prof. H. 

 H. Wilder. 



VI 



VII 



VIII 



Fig. 58 Diagram of the various conditions shown by the "magnesium embryos"' from entire 

 absence of the cyclopean eye /, to deeply buried eye II, perfect single cyclopean eye ///, double-eye, 

 IV, two approximated eyes V, eyes unusually close together VI, normal VII, three eyes and fourth 

 lens VIII. 



The normal is a mean from which different degrees of abnormal- 

 ities are but greater or less deviations. It is possible to arrange 

 almost any type of abnormality in such a series. Supernumerary 

 arms or legs on one side might exist in various individuals in dif- 

 ferent numbers down to the single normal one; other specimens 

 could be found showing degenerate or small arms and finally 

 armless or legless individuals are known. 



MORPHOLOGY OF MONSTRA MONOPHTHALMICA ASYMMETRICA 



A brief description of the asymmetrical monophthalmica mon- 

 sters in life has been given above, but their true nature and 

 structural conditions are impossible to detect without sections. 

 It is found that here again a contmuous series exists, beginning 

 with the ordinary two-eyed individual through all gradations to the 

 complete disappearance of one eye. 



The section through the middle of the eyes in a normal embryo 

 of thirteen days old is illustrated in Fig. 59. The eyes, of course, 

 are equal in size and alike differentiated structurally. In the salt 

 solutions, however, many embryos occur with one eye perceptibly 



