CONTENTS 



A. GENERAL PART. 



I. 



II. 



III. 



IV. 



V. 

 VI. 

 VII. 



VIII. 

 IX. 

 X 



XI. 

 XII. 



Origin and Systematic Position of the Heterosomata . i 



Fossil Heterosomata ...... 9 



Evolution of Asymmetry within the Order . . 10 



Albinism, Ambicoloration and Reversal . . .22 



Development . . . . . . .30 



Se.xual Differences . . . . . -33 



Classification . . . . . . -35 



A. General . . . . . . -35 



B. Generic and Specific Characters . . . .43 



Geographical Distribution . . . . .48 



Notes on Measurements, etc. . . . .50 



Bibliographical Method . . . . -51 



Abbreviations . . . . . .52 



List of Papers . . . . . .52 



SYSTEMATIC PART. 

 Order HETEROSOMATA 

 Family PsETTODiD.iE 



I . Psettodes, Bennett 

 Family Bothid.5 



Subfamily Paralichthin.^ 



1. Tephrinectes, Giinther 



2. Thysanopsetta, Giinther 



3. Hippoglossina, Steind. 



4. Lioglossina, Gilbert 



5. Paralichthys, Girard 



6. Pseudorhombus , Bleeker 



7. Tarphops, Jordan and Thompson 



8. Xystreurys, Jordan and Gilbert 



9. Taniopsetta, Gilbert 

 ID. Ancylopsetta, Gill 



11. Gastropsetla, Bean 



12. Syaciuin, Ranzani 



13. Cyclopseita, Gill 



14. Citharichthys, Bleeker 



15. Etropus, Jordan and Gilbert 



1 6. Trichopselta, Gill 



17. Engyophrys, Jordan and BoUman 



18. Perissias, Jordan and Evermann 



19. Monolene, Goode 



20. Eucitharus, Gill 



21. Citharoides, Hubbs 



56 

 57 

 57 

 60 

 61 

 62 

 64 



65 

 68 

 69 

 89 

 1x8 

 119 

 122 

 124 

 128 

 129 

 134 

 139 

 154 

 160 

 161 

 162 

 164 

 168 

 170 



