354 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



material was found in them, sufficient to make certain the 

 Muschelkalk age of at least part of the series. 



The following is a preliminary list of the cephalopods of 

 the Middle Triassic found in these collections from the 

 Daonella beds of the Humboldt region : 



Akcrstium, Joanniies gabbi Meek, /oannifes sp. nov. 



LYTOCERATID.E, Monophyllites billing sianus Gabb 



Meekoceratid^, Beyrichites rotelliformis Meek, Lecanites sp. nov. 



HuNGARiTiDiE, Hiingarites sp. nov. 



Ptychitid^, Ply chiles sp. nov. , P. ? perplanns Meek 



PiNACOCERATiD.E, Sagecevas gabbi Mojsisovics 



Celtitid^, Cellites halli Mojsisovics 



TROPITID.E, Eulomoceras laubei Meek 



Ceratitid^, Acrochordiceras hyatti Meek, Balalonites two new species, 

 Anolcites meeki Mojsisovics, A. whilneyi Gabb, Protrachyceras 

 americanum Mojsisovics, P. subasperiun Meek, Eudiscoceras gabbi 

 Meek, Japonites ? sp. indet., Ceratiles blakei Gabb, C. meeki Mojsiso- 

 vics, C. nevadanns Mojsisovics 



Nautiloidea, Orthoceras blakei Gabb, Nautilus niulticameratus Gabb, 

 Nautilus whilneyi Gabb 



In addition to the above, Meek has described from this 

 formation as Halohia lommeli, a species very closely allied to 

 Daonella lommeli Wissvaann, of the Wengen beds, base of 

 the Alpine Upper Trias. 



In several publications Dr. E. von Mojsisovics (20 and 

 24) has referred the Star Peak fauna to the lower part of 

 the Upper Trias, correlating them with the Fassanic substage 

 of the Tirolic series, and comparing them more especially 

 with the Ceratite beds of Rikusen, Japan, and the Buchen- 

 stein beds of the Alps. But Dr. A. Tornquist (35 and 36) 

 has shown that Ceratites of the group of Ceratites nodostis, 

 a group diagnostic of the upper Muschelkalk of the Ger- 

 manic basin, are found in the Buchenstein beds of the 

 southern Alps, and that this formation must also be classed 

 with the Muschelkalk, This makes it necessary to refer 

 the Ceratite beds of Japan and their equivalents in Nevada 

 to the Middle Trias. Even without this evidence, the occur- 

 rence of Pty chiles, Hungarites, Beyrichites, Acrochordi- 

 ceras, Ceratites, and Balalonites would be enough to make 

 the reference certain, as none of these genera in their typ- 

 ical forms occur higher up than the Muschelkalk. 



