13 



Page. 



Pecten ii 



Pinus edulis 91 



Polorthus 85 



tibialis 12 



Populus angustifolia 92 



monilifera 92 



Prosopis glandulosa 92 



Pterichthys 144 



Ptychoceras 94 



Pupa longurio 1 52 



Quercus Emoryi 91 



Ravenia Blandi 1 54 



Saturnia (Samia) Cecropia. . . 117 



Salizaria 92 



Scutellaria 92 



Sequoia 87 



Sigillaria 50 



Spermophila parva, n. sp 151 



Spiraxis 154 



Spirulsea rotula 12 



Page. 



Stenogyra octonoides 152 



Strophia 1 52-1 53 



Milleri 153 



uva 152-153 



Slylonurus excelsior 8 



Succineagyrata 1 51-152 



Terebratula plicata 10 



Harlani 11, 85 



fragilis 1 1 



Trochosmilia conoides 12 



Tudora . 151-153 



megacheila 151 



versicolor 152 



Ungnadia speciosa 92 



Unio 142 



Venericardia perantiqua 12 



Venus mercenaria 141 



Yucca angustifolia 93 



baccata 93 



Zonites petrophilus, n. sp. . . . 150 

 Wheatleyi, n. sp 1 50 



ERRATA. 



Page 3, nth line from top, for Asaphas, read Asaphus. 



" 8,9th and nth lines from bottom: for Stylomurus, read 

 Stylonurus. 

 50, 14th line from bottom : for graduation, read gradation. 

 85, 6th " " " for Palorthis, read Polorthus. 



92, 2d line from top : for Prozopis, read Prosopis. 

 92, 6th " " " for monolifera, read monilifera. 

 92, I2^h " " " for Tonquieria, r^rt^ Fouquieria. 

 92, i8th " " bottom: for Scutillaria, read Scutellaria. 



92, 17th " " " for Cardioz permum, read Cardio- 

 spermum. 



93, 6th line from top : for vaccata, read baccata. 

 93,21st " " bottom: for Texamum, r^«^ Texanum. 



94, i8th " " " for Gryphea, read Gryphssdi. 

 ' 104, 5th" " " f or fortris, rm<f fortis. 

 ' 151,14th" " top: for caniformis, r^rtii canifrons. 

 ' 151,15th" " " for grivigula r^a^ griseigula . 



