METAMORPHIC SERIES OF SHASTA COUNTY. 607 



Trachyceras sp. (like Tirolites in youth). 



" sp. (with line costaa in youth, coarse in age). 



Tropites subbullatus, Hauer. 



" sp. (with narrower coil than T. subbulatus). 



" sp. (with smooth narrow coil). 



" sp. (with rough narrow coil). 



" saturnus, Dittmar. 



" conf . janns, Dittmar. 

 Sagenites conf. erinaceus, Dittmar. 

 Halorites conf. ramsaueri, Gabb (not Hauer). 

 Eutomoceras conf. sandlingense ; Hauer. 

 Eutomoceras, sp. 

 Acrochordiceras sp. 

 Ptychites ? 



Nannites conf. spurius, Muenster. 

 Lecanites sp. ? 



Arcestes conf. calif ornicas, Hyatt. 

 Sageceras or Beneckeia ? 

 Nautilus triadicus, Mojsisovics. 



sp. 

 Orthoceras sp. ? 

 Atractites sp. 

 Aulacoceras sp. 

 Pecteti sp. 

 Gervillia sp. 



Halobia superba, Mojsisovics. 

 Posidonomya conf. wengensis, Wissmann 

 Modiola sp. 

 Capulus sp. 

 Natica sp. 



Rynchonella conf. solitaria, Hyatt. 

 Terebratula sp. 



About six miles north of the last named locality, at Terrup- 

 chetta on Squaw creek, the Trachyceras bed is well exposed, and 

 many fossils were collected from this horizon, including most of 

 the forms found at Madison's, and in addition a Nautilus with 

 two sharp angles on the external sides like Nautilus gale atus, 

 Mojsisovics, of the zone of Trachyceras aonoides, of the Karnic. 



The Atractites beds. — These beds form the middle division 

 of the Hosselkus limestone ; they are very hard and siliceous, 



