4/2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



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Obolus (Fordinia) perfectiis, new species 65, pi. 7, fig. l6 



compared with Elkania desiderata 66 



Obolus {Fordinia) hellulus 64, 66, 67 



Obolus {Fordinia) gilberti 65, 66 



stratigraphic position and association 178, 179 



Obolus {Lingiilobolus) , classification of 142, 144 



evolution of pl. n (pP. 140-141) 



Obolus {Mickwitzclla), new subgenus, original description copied 70 



classification of 142, I44 



compared with Eiiobolus and Schiiiidfia 70 



evolution of pl- n (pp- 140-141) 



Obolus {PalcB obolus), classification of 142, 144 



evolution of pl. n (pP- 140-141) 



Obolus {Schniidtia) , classification of 142, I44 



evolution of pl- n (pP- 140-141) 



Obolus {Thysanotos) Mickwitz, in synonymy 70 



Obolus (Thysanotus) Walcott, in synonymy 70 



Obolus {Westonia), classification of 142, I44 



evolution of pl- n (pP- 140-141) 



mentioned 67 



Obolus {Westonia) bottnica, compared with Obolus {Westonia) elonga- 



tus 68 



Obolus {Westonia) dartoni, new species 67, pl. 7, fig. 14 



compared with Obolus {Westonia) ella 67 



Obolus { Westonia) euglyphus 67 



Obolus {Westonia) ella, compared with Obolus {Westonia) dartoni 67 



compared with Obolus {Westonia) ella onaqniensis 67 



Obolus { JVcstonia) wasatchensis 69 



stratigraphic position and association. 182, 183, 184, 196, 197, 198, 202, 211 

 Obolus {Westonia) ella onaqniensis, new variety, characterized, not 



figured 67 



compared with Obolus {Westonia) ella 67 



Obolus {Westonia) elongatus, new species 68, pl. 7, fig. 12 



compared with Obolus {Westonia) bottnica 68 



Obolus { Westonia) Unlandensis 68 



Obolus {Westonia) escasoni, compared with Obolus ivorthcni 64 



Obolus {Westonia) euglyphus, compared with Obolus {Westonia) dartoni. 67 

 Obolus {JVestonia) Unlandensis, compared with Obolus {Westonia) 



elongatus 68 



compared with Obolus {IJ^cstouia) wasatchensis 69 



Obolus {Westonia) iphis, compared with Obolus {Westonia) notchensis. 69 



stratigraphic position and association 192 



Obolus {Westonia) notchensis, new species 69, pl. 7, fig. 13 



compared with Lingulella ampla 69 



Obolus { Westonia) iphis 69 



Obolus {Westonia) stoneanus 69 



stratigraphic position and association 173 



Obolus {Westonia) stoneanus, compared with Obolus {Ji'cstonia) notch- 

 ensis 69 



