LIST OF ILLUSTRATIOl^^S. 



PLATES. 



Facing page. 



1. Thorax of Hymenoptera 92 



2. Thorax of Hymenoptera 92 



3. Thorax of Hymenoptera 92 



4. Thorax of Hymenoptera 92 



5. Thorax of Hymenoptera 92 



6. Thorax of Hymenoptera 92 



7. Thorax of Hymenoptera 92 



8. Thorax of Hymenoptera 92 



9. Thorax of Hymenoptera 92 



10. Thorax of HymenojJtera 92 



11. Thorax of Hymenoptera 92 



12. Thorax of Hymenoptera 92 



13. Thorax of Hymenoptera 92 



14. Thorax of Hymenoptera 92 



15. Wing articulation of Hymenoptera 92 



16. Venation of Hymenoptera 92 



17. Skull of Blennius ocellaris. Part of skull of Anarrhichas lupus, showing 



teeth 188 



18. Skull of Lycichthys paucidens 188 



19. Skull of Anarrhichas lupus 188 



20. Cranium of Lycichthys latifrons 188 



21. Lycichthys latifrons. Upper teeth of Lycichthys denticulatiLS. Mandibular 



teeth of Lycichthys denticulatus 188 



22. Lycichthys denticulatus. Upper teeth of Lycichthys latifrons 188 



23. Cranium of Anarrhichas lupus, from above. Cranium of A. minor, from 



above. Cranium of A. minor, from side 188 



24. Anarrhichas minor . CrsLniumoi Anarrhichas lupus, horn. Bide. Upper teeth 



of A. lupus 188 



25. Upper teeth of J.na?T^ic/jasmmor. Vipper teeth, oi Anarrhichas lupus. Man- 



dibular teeth of A. lupus 188 



26. Anarrhichas lupus. Mandibular teeth of A. lupus 188 



27. Skull of Anarrhichthys ocellatus 188 



28. Young of Anarrhichas lupus. A, Upper teeth, and B, mandibular teeth of 



Anarrhichthys 188 



29. Formation and segmentation of the egg 226 



30. Development within the egg, nauplius stages 226 



31. Development within the egg, metanauplius stage 226 



32. The free-swimming larva, first copepodid stage 226 



33. The second copepodid stage 226 



34. Longitudinal sections of male and female second copepodid larvae 226 



35. Sections showing internal anatomy 226 



36. Young adults of Achtheres ambloplitis 226 



37. Skulls of Sylvilagus floridanus mallurus contrasted with skulls of Sylvilagus 



floridanus hitchensi 228 



IX 



