5 So 



NEW YORK STATE MUSEUM 



Protovirgularia dichotoma, 13, 48, 128, 



139- 2 43-44- 



explanation of plates, 509, 511. 



figures, 243. 

 Psilophyton gracillimum, 218, 219. 



See also Dendrograptus gracillimus. 

 Pterograptus, 266. 

 dilaceratus, 283. 

 divergens, see Coenograptus ( ? Pleuro- 



graptus ? Pterograptus) divergens. 

 Pterygometopus callicephalus, 431. 

 Ptilograptus, 127, 132, 147-48, facingp. 66. 

 acutus, 147, 148. 

 foliaceus, 56, 132, 149. 

 geinitzianus, 132, 148. 

 glomeratus, 147, 149. 

 hartnageli. 52, 53, 127, 132, 149. 



explanation of plate, 491. 



figure, 149. 

 plumosus, 132, 147, 148. 

 poctai, 13, 48, 127, 132, 148-49. 



explanation of plate, 491. 



figure, 148. 

 ramale, 147, 149. 

 suecicus, 147. 

 tenuiramosus, 132. 

 tenuissimus, 206. 

 Ptiograptus, 69, 127, 132, 175-76, facing 



p. 66. 

 percorrugatus 58, 127, 132, 175, 176-77. 



explanation of plate, 498. 



figures, 177. 



Quebec, 20, 328, 386, 387, 430, 436, 446, 

 481. 



Rastrites, 55, 60, 139, 458. 



barrandii, 139, 205, 206, 208, 277. 

 figure, 208. 



beecheri, 455. 



linnaei, figure, y6. 

 Renevier, cited, 64. 



Rensselaer county, 13, 18, 308. 

 Retiograptus, 67, 68, 122, 130, 139. 399, 

 462, 467, 472, 481, facing p. 66. 

 barrandii, 139, 463. 

 eucharis, 122, 139, 397, 398, 462. 

 geinitzianus, 15, 19, 51, 54, 130, 139, 

 252, 388, 462, 463-67, 471. 

 explanation of plates, 550, 557. 

 figures, 463. 

 tentaculatus, 70, 122, 139, 462, 466, 481. 

 venosus, 471. 

 Retiolites, 122, 123, 125, 130, 139, 378, 

 467-69, 473, 474, facing p. 66. 

 ensiformis, 139. 

 geinitzianus, 54. 

 figures, 468. 

 var. venosus, 52, 53, 130. 139, 469-71. 

 explanation of plates, 551, 556. 

 figure. 468. 

 zone, facing p. 9. 

 nassa, 377. 



figures, 468. 

 venosus, 123, 139, 469, 470. 

 Retiolitidae, 125. 126, 130, 7,y~, 462-84. 

 Retioloid structure in the periderm, in- 

 fluence of spines on development of, 

 85-87. 

 Retioloidea, 76, 229. 

 Rhabdophora. 229. 

 Rhabdopleura, 97. 

 Rhizograptus, 132. 173. 



bulbosus. 56. 132. 

 Richardson, C. H., cited. 29. 143. 

 Richmond beds?, facing p. 9. 66. 

 Ringueberg. E. N. S.. cited, 141, 19S, 



200-1, 202. 

 Rochester, T64, 452. 



Rochester shale, 52. SSS7- facing p. 66. 

 Rocky mountains, 50. 

 Rodonograptus, 183. 

 Roomer, mentioned. 430. 

 Rominger, cited, 1 58. 



