INDEX 



Page numbers referring to descriptions of genera and species are printed in black face type. 



Acanthaspis, 78, 115, 117, 193. 



armata, 14, 117-18, 198. 



armatus, 117. 



decipiens, 118. 



pruemensis, 118. 

 Acanthodes, 181. 



affinis, 16. 



concinnus, 16. 



? pristis, 17, 64. 



semistriatus, 13. 

 Acanthodians, 179, 180, 181. 

 Acanthodidae, 23. 

 Acanthodii, 23, 63-64. 

 Acanthoessus ? pristis, 64. 

 Acantholepis, 78-79, 80, 193. 



fragilis, 14, 15, 79-80, 200. 



pustulosus, 79. 

 Acanthopterygii, 183. 

 Acipenseridae, 171. 

 Actinophorus clarki, 19. 

 Actinopterygii, 23, 90, 92, 165, 170-72. 

 Agassichthys agassizi, 112. 



manni, 102, 103. 



sullivanti, 102, 103. 

 Agassiz, Louis, cited, loi, 116; mentioned, 



177. 

 Agnatha, 12-13, ^6, 20, 22, 23, 24-54. 

 Agoniatite limestone, 129. 

 Allegany county, 21. 

 Ambocoelia umbonata, 85. 

 American Museum of Natural History, 



acknowledgments to, 12. 

 Amia, 182. 



Anarthrodira, 105, in. 

 Anaspida, 23, 28, 31. 



Antiarcha, 23, 26, 27, 28, 32-33. 

 Apateacanthus, 79, 80. 



vetustus, 17, 81, 200. 

 Apedodus priscus, 21, 166, 196. 

 Appalachian strait, 189. 

 Arachnids, 28. 

 Arisaig series, 13. 

 Aroostock county, Me., 13, 32. 

 Arthrodira, 15, 20, 23, 88, 89-157, 158, 159, 



192, 220; systematic arrangement, 99. 

 Arthrodire undet., 198. 

 Arthrognathi, 90. 

 Ascidians, 28. 

 Aspidichthys, 157, 220. 



sp., 15. 



clavatus, 19, 156. 



? notabilis, 16, 157. 

 Asterolepidae, 23, 26, 27, 28, 32, 33-54, 89, 



90, 91, 118. 

 Asterolepis, 32, 36, 39-40. 



clarkei, 13, 32, 40-41, 208. 



hoeninghausii, loi, 112. 



maxima, 50, 51, 54. 



ornata, 40. 

 Asterosteus, 99, 104, 105, 106, no, 112, 



193- 



stenocephalus, 14, 113. 

 Astraspis desiderata, 12, 33. 

 Ateleaspidae, 23. 

 Ateleaspis, 27. 



tessellata, 26. 

 Atthey, T., cited, 97. 



Balfour, cited, 158. 

 Bedford, O., 18. 



225 



