X LIST OF ILLUSTRATIONS. 



Facing page, 



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



floridanus hitchensi 228 



39. West American Vitrinellids 234 



40. West American Vitrinellids 234 



41. Female of Ergasilus labracis 400 



42. Female of Ergasilus centrarchidarum 400 



43. Female of Ergasilus cseruleus 400 



44 . Female of Ergasilus manicatus 400 



45. Female of Ergasilus veriscolor 400 



46. Male of Ergasilus chautauquaensis 400 



47. Female of Ergasilus mugilis 400 



48. Female of Tucca impressus 400 



49. Male of Tucca impressus 400 



50. Female of Tucca corpulentus 400 



51. Female of Artacolax ssetiger 400 



52. Female of Artacolax ardeolse 400 



53. Female of Bomolochus eminens 400 



54. Female of Bomolochus condnnus 400 



55. Male of Bomolochus concinnus 400 



56. Female of Bomolochus nitidus 400 



57. Male and female of Bomolochus solex 400 



58. Female of Bomolochus exilipes 400 



59. Female of Bomolochus teres 400 



60. Female of Taeniacanthus alhidus 400 



61. Alabina from the west coast of America 418 



62. Alabina from the west coast of America 418 



63. Crystals of Calamine, Biotite, and Marcasite 580 



64. Pseudomorphs of Marcasite after Pyrrhotite 580 



65. Male and female of Midias lobodes 634 



66. Male and female of Paralebion elongatus 634 



67. Female of Achthcinus dentatus 634 



68. Female of Lermcopoda inermis 634 



69. Hyalinothrix millespina, type 664 



70. Hyalinothrix millespina, type 664 



71. Eyalinithrix millespina 664 



TEXT FIGURES. 



Page. 

 Arenicola marina, anterior end, dorsal aspect, to show the prostomium; L, lateral 



lobe of prostomium; L. N., lip of nuchal organ; M, median lobe of prosto- 

 mium; M. Gr, metastomial groove; W, first notopodiimi; Ph, pharynx; S, 



aperture of statocyst. X4 5 



Arenicola claparedii, anterior end, dorsal aspect of specimen from Crescent City, 

 California, to show the prostomium. L, lateral lobe of prostomium; M, 



medianlobe; ifo, mouth; iV^, first notopodium. X6 12 



Antero-ventral view of the anterior portion of A. pusilla Quatrefages. In this 

 view all the parts, except the prostomium, are seen somewhat foreshortened. 

 X8. L, lateral lobes of prostomium; if, median lobe; M.Gr, metastomial 



groove; Mo, mouth; Nr^, first neuropodium 14 



Dorsal view of the anterior end of A. pusilla Quatrefages showing the widely 

 divaricated lateral lobes (L) and the median posterior portion (P) of the 



prostomium {N') first notopodium; {N. Gr) nuchal groove. X8 15 



Antero-ventral view of the anterior end of a specimen of A. claparedii from 



Crescent City, California. X6 16 



Dorsal view of the anterior end of the same specimen . X 6 16 



