LIST OF ILLUSTRATIONS. XIII 



I'LATES. 



Faeinji' page. 



1-8. The genus Acronyeta 194 



9. Illustrations of Pantheids 194 



10. The genus Acronyeta and its allies 194 



11-13. The genus Acronycia 194 



14. Body structures of Acronycia 194 



15. Head structures of Acronyeta 194 



16. Venation of Acronyeta 194 



17. Leg structure of Acronyeta 194 



18. Leg and other structures of Acronyeta 194 



19-22. Genital structures in Acronyeta 194 



23, 24. Tifcla cra^satelloides Conrad 378 



25. Anatomy of Tivela crnssatelloides Conrad 378 



26-28. Cambrian Brachiopoda 420 



29-32. American ouiscoid Merocheta 468 



33. Lateral, superior, and posterior views of skull 476 



34. Branchial arches and hyoid apparatus 476 



35. Anterior elements of dorsal and anal tins, and pelvic girdle 476 



36. Maxillaries, suborbital ring, superdavicle, and shoulder girdle 476 



37. Suspensorium, lower jaw, and opercles 476 



38. Vertebrie, hypural, and atlas 476 



39. The tree frog ffyhi reyiUa 492 



40. External morphology of leeches 564 



41-44. Brachyura collected by the Albatross 616 



45, 46. Vertebra? of Pterosphenus schncherti 638 



47. Feather-tracts of Colinus virf/inianus 654 



48. Feather-tracts of Dendragapus obscuriis 654 



49. Feather-tracts of Ortalis vetula mccalU 654 



50-52. African Diplopoda 666 



53, 54. Diplopoda of the family Striariida; 676 



.55, 61. African Diplopoda 740 



62. New Hydroida from the Pacific coast and Alaska 754 



63. New Hydroida from Puget Sound 754 



64. The Gonosome of Lafoea 754 



65, 66. Bison oecidentalis Lucas 772 



67-70. Bison antiquus Leidy 772 



71,72. Bison 772 



7.3-76. Bison crassicornis Richardson 772 



77-80. Bison alleni Marsh 772 



81. Bison firox Marsh 772 



82. Bison latifrons (Harlan) 772 



83. Bison crassicornis Richardson, Bison latifrons (Harlan) 772 



84r. Ovis sraphoceras (Cope) 772 



85. Map of stations along the land boundary between Mexico and the 



United States from the Rio Grande to the Pacific 782 



86. Haplophthalinus puteus W. P. Hay, new species 872 



87, 88. Leptonacea of North America 898 



89. Ascaphus truei, new species 902 



