LIST OF ILLUSTRATIONS. 



Facing 



PLATES. page. 



1 . Slab of Scyphocrimis 60 



2. Two complete calices of Scyphocrinus 60 



3. New mollusks from the Bahama Islands 110 



4. Wings of species of Agromyzidse 154 



5. Heads of species of Agromyzidag 154 



6. Parts of species of Agromyzidse 154 



7. A fossil sponge from New Jersey 155 



8. Skulls of Old World bisons, known as Bison priscus 200 



9. Skulls of Bison priscus and Bison occidentalis 200 



10. Skulls of Bison occidentalis 200 



11. Skulls of i?ison occidentalis 200 



12. Skulls of Bison occidentalis 200 



13. Skulls of Bison occidentalis 200 



14. Skulls of Bison crassicornis 200 



15. Skulls of Bison priscusf and Bison aUeni 200 



16. Skull of Bison alleni 200 



17. Skull and cervical vertebrse of Bison alleni 200 



18. Skull of Bison regius 200 



19. Skull, horn cores, and tooth referred to Bison lati/rons 200 



20. Pliocene mollusks of the coastal plain ■ 238 



21. Pliocene mollusks of the coastal plain 238 



22. Pliocene mollusks of the coastal plain 238 



23. Details of flies in subfamily Botauobiinse 266 



24. Detailsof flies in subfamily Botanobiinse 266 



25. Skull and premaxilla of Camelops huerfanensis 278 



26. Details of teeth and jaw of Camelops huerfanensis 278 



27. Skull of Pithecus mindorus from Mindoro 342 



28. Skull of Pithecus mindorus from Mindoro 342 



29. Skull and teeth of Rusa nigellus from Mindanao 342 



30. New crabs of families Grapsidse and Ocypodidse 358 



31 . New crabs of families Grapsidse and Ocy podidse 358 



32. New crabs of families Grapsidae and Ocypodidse 358 



33. New crabs of families Grapsidae and Ocypodidee 358 



34. Rotatoria of Washington and vicinity 406 



35. Rotatoria of Washington and vicinity 406 



36. Rotatoria of Washington and vicinity 406 



37. Rotatoria of Washington and vicinity 406 



38. Rotatoria of Washington and vicinity 406 



39. Some new hymenoptera 444 



40. North American spring-tails of the subfamily Tomocerinae 472 



41. North American spring-tails of the subfamily Tomocerinae 472 



42. Crinoids of the fossil genera Homocrinus and Lasiocrinus 484 



43. Parorchis avitus, new species 556 



44. Details of Delphacidae 640 



IX 



