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pjette Art, ere imidlertid altfor vigtige til ikke at blive meddelte 

 her in extenso: 



(.In anolher species, afler Ihe eje had Ihus by Ihe same process 

 of translation and of torsion been brought from the one side to the 

 olher, the dorsal fln gradually exlended beyond Ihe anterior edge of 

 Ihe orbit of this eye. This young flounder Ihus soon presented a 

 stage in which the eye from the blind side appeared to have passed 

 through Ihe head between Ihe frontal bone and the base of the an- 

 terior rays of ihe dorsa! Qn. Ås I had, however. followed the whole 

 developmenl in living specimens, I knew from aclual observation Ihat 

 the mode of transfer of the right eye had been identical wilh thai 

 of Ihe preceding species. These observations thus far confirm in 

 the main Malm's explanation of the development of young symme- 

 tricai flounders into the well-known older stages. To my great 

 aslonishraenl, therefore , 1 caplured one day a number of flounders 

 (about an inch in lenglh) closely allied lo the Plagusiæ of Sleenslrup, 

 Ihe so- cailed Bascania of Schiodle; Ihey were so perfecliy trans- 

 parent ihai Ihey seemed the meresl film on Ihe botlom of the glass 

 Vessel in which Ihey were kept. They were still enlirely syramelrical, 

 the eyes well removed from the snout, wilh a dorsal fin extending 

 almost lo Ihe nostril, far in advance of the anlerior edge of Ihe 

 orbils of the eyes. They were of course al once set down (from 

 iheir size) as belonging to a species of flounder in which the eyes 

 probably remained always symnielrieal, and 1 prepared lo walch ils 

 future development. It was therefore wilh considerable interesl thai 

 1 noticed, afler a few days, thai one eye, the right, moved ils place 

 somewhal Iowards Ihe upper pari of the body, so thai when ihe 

 young fish was laid on ils side, the upper half of the right eye 

 could be plainly seen, through the perfecliy transparent body, to 

 projecl above the lefl eye. The right eye (as is Ihe case wilh the 

 eyes of all flounders), being capable of very extensive vertical move- 

 menls, through an arc of nearly 180°, could Ihus readily turn to 

 look through Ihe body, above the lefl eye, and see whal was pas- 

 sing on Ihe lefl side, Ihe right eye being of course useless on ils 

 own side as long as the fish lay on ils side. I may mention here 

 Ihal this young flounder, uniil long after the right eye came out on 

 the lefl side , conlinued frequenlly lo swim vertically, and that for a 

 considerable lenglh of time. This slighl upward lendency of the 

 right eye was conlinued in connection wilh a molion of translation 



