237 



lowards Ihe anlcrior pari of llie head till llic eyc, when seen llirough 

 Ihe body from Ihe lefl side, was enlirely clear of Ihe lefl eye, and 

 was lims placed somewhal in advance and above it, bul slill enlirely 

 in Ihe rear of Ihe base of Ihe dorsal fin exlending lo Ihe end of 

 Ihe snoul. Whal was my aslonishment on Ihe following day, on 

 lurning over Ihc voung flounder on ils lefl side, lo find Ihal Ihe 

 righl eyc had aclnally sunk inlo Ihe lissues of Ihe head , penelraling 

 inlo Ihe space belween Ihe base of Ihe dorsal fin and Ihc fronlal 

 bone, lo such an cxlenl Ihal Ihc lissues adjoining Ihc orbil had 

 slowiy closed over a pari of Ihe eyc, leaving only a small elliptical 

 opening, smaller than Ihe pupil, Ihrough which Ihe righl eye could 

 look when Ihe fish was swimming verlically, While Ihe young 

 flounder lay on ils side, Ihe righl eye was constanlly used in loo- 

 king through the body, and could cvidenlly see exlremely well all 

 Ihal look place on Ihc lefl side. On Ihe following day Ihe eye had 

 pushed ils way slill farlher Ihrough , so Ihal a small opening now 

 appeared opposile il, on ihe lefl side, Ihrough which Ihe righl eye 

 could now see directly , Ihe original opening on Ihe righl side being 

 almosl enlirely closed. Soon after, Ihis new opening on Ihe lefl 

 increased gradually in size, Ihe right eye pushing ils way more and 

 more lo Ihe surface and finally looking oulward on Ihe lefl side 

 wilh as much freedom as Ihe eye originally on Ihe lefl; Ihe opening 

 of Ihc righl side having permanenlly closed. I have Ihus in one 

 and Ihe same specimen been able lo follow Ihc passage of Ihe eye 

 from Ihe right side to the lefl through the integumenls of the head, 

 belween the base of llie dorsal fin and the frontal bonc.» 



Hvad der af de foranslaaende Data, hentede fra Iagttagelses- 

 rækken paa levende Individer af denne sidste Art, synes mig for 

 Øieblikket især at burde fremhæves til Sammenligning med hvad 

 jeg i det Foregaaende har meddelt om de tilsvarende Stadier 

 af visse vandkiare Flyndre, er følgende: 



1) at Øiets fuldstændige Flytning fra den ene Side til 

 den anden foregaar i et Tidsrum af ikkun meget faa Dage. 

 Derved bliver det forklarligt, baade al de næsten symmetriske 

 Unger og de i fuld Flynderskikkelse fremtrædende Individer (sé 

 mine Figurer i første Afhandling, sammenholdte med dem paa 

 Tavlen i denne) have samme Størrelse (smlgn. S. 225), og at 



