i-i.iirNi)i;i;-KiMii;s. 



365 



iiltei'iition or iinnc .il nil, .iinl the |Piirts (it the liiaiii sni I'm, or ;it ;ill cxciits its predt'ccssor, tli<' oiiibrvonic 



rc'tiiiii tlicii- niiijiii.il |"isiti(>n in the skull, while in most vci'tical lln, cxtdmls so lar i'orward on tlic dorsal edge 



rases the iialatinc tcctli, and sometimes the jaw-tcetli ' of the head that the eye mnst Ibrce its way under the 



as \\c'll, remain almost utiihan'''ed. I)ase ot tiiis lin, aiinarentK' sti-aiLiht tiii"ouL!li the li(!ad. 



/,•.". 



./'••■ 



Fig. 101. SUiiU I't l'lciirom:rli:.i iiliitc^nii, l' ., tiiaus (he iiutiinil size. 



0, vomer; /;•. a. d. right, />. n. s, k'ft lateral clhiiioid houe; /)'. d, right, 



fr. .«, left frontal bone, the anterior parts of these bones being pressed 



forward to the right, and marked in tlie same way. 



S4U.S. 



Squ d 



Fig. 102. Sehemalic ligure of the skull of Fleuroiiectes platessa, 

 borrowed from TuAQUAiu, as an explanation of the position of the 

 various bones in the preceding figure, e, ethmoid bone; jr. a. d, right, 

 fr. a. .*, left lateral ethmoid bone, eaeh piereed with a hole to receive 

 the olfactory nerve; Jr. d, right, j'r. .1, left frontal bone. — The un- 

 shaded parts of these bones on the left indicate their secondary ex- 

 crescences. — j'r. p. d, hind frontal bone on the right, j'r.p.s, on the 

 left; p. d, right, p. s, left parietal bone: o. s, upper occipital bone; 

 mast, d, right, mast, s, left mastoid bone; sqn. d. right, squ. s, left 

 squamosal bone. The line oa shows the original dorsal edge of the 

 skidl, ox the secondary one. w. t/, right, oc. s, left eye. 



Fig. lO.S. Young Sole (^'olea ciil;jari.-'). \> mm. long and 4'.^ mm. deep. .U"ter M.m.m. .r — //, that part i.f the fnlure base of the dorsjd 

 tin under which the left (upper) eye has probably passeil: j, the optic lolies of the brain. 



These arc the oi(rniar\- clianges during tiie pa.ssage Tiiis is the fourse of the wanderings of the eye in the 



of tlio one eve from one side of tiie body to the otiier; tran.sparent, perfectly clear Flatfishes — i)rol)al)ly ini- 



hut there are certain forms of Flatfish (among them , mature forms of species not yet fixed — which Steex- 



probahlv the common Sole. fig. lit.'i) in which the dor- .sTi;i r .ind .\. .Ac.vssiz (see above) have figured cand 



