324 BRANSON AND GREGE:R AMSDEN FORMATION OF WYOMING 



BUCANOPSIS or BELLEROPHON 



Plate 19, figures 9-10 



Two interior casts representing two species of Bucanopsis or Bellero- 

 phon were collected at locality number 1. 



LOXONEMA WORT HEN I (Weller) 



Plate 18, figure 6 



L916. Loxonema wortheni Weller. Contributions from Walker Museum, volume 

 1, number 10, page 261, plate XVIII, figures 18-20. 



Originally we identified onr fragmentary specimens with Loxonema 

 yandellana Hall, but they agree with Weller^s species, L. wortheni, de- 

 scribed in 1916, in every detail. 



CYGLOCERAS sp.? 



One fragment that resembles Cydoceras sequoyahensis Snider was col- 

 lected. 



ORTHOCERAS sp. ? 



A few specimens too fragmentary for identification were collected. 



PHILLIP8IA sp.? 



Plate 19, figure 16 



Several specimens of Phillipsia were collected, but most of them v^ere 

 lost during transportation. The ones in the collection are too imperfect 

 for specific reference. 



From all collections made from the Amsden the number of specimens 

 of each species listed below were selected as worthy of placing in our 

 cabinets. These numbers furnish a rough approximation of relative 

 abundance. 



Orbiculoidea 3 Cleiothyris 5 



Orthotetes 37 Composita 314 



Meekella 3 Ortonia 1 



Olionetes 1 Microdon 1 



Productus phillipsi 48 Myalina 7 



Pustula 1 Bulimorpha 4 



Schizophoria 2 Bucanopsis 3 



Pugnoides 20 Loxonema 4 



Tetracamera 2 Phillipsia 1 



Spiriferina 25 Zapbrentis 54 



Spirifer welleri 80 Chsetetes 54 



Spirifer pellsensis 51 Paleonilo 29 



Spirifer shoshonensis 4 Ortboceras 2 



Martinia 1 Cycloeeras 1 



Eumetria 7 



