Reviews 



The Permo-Carhoniferous Ammonoids of the Glass Mountains, West 



Texas, and their Stratigraphical Significance. By Emil Bose. 



University of Texas Bulletin, No. 1762, Nov. 5, 1917. 



The cephalopod faunas of the Permian are still imperfectly known 



in spite of the work of forty years in many parts of the world. The 



classic works of Karpinsky in Russia, Waagen in India, C. A. White in 



Texas, and Gemmellaro in Sicily have furnished the bulk of our knowledge 



of these interesting transitional forms. Dr. Bose has added a fifth to 



these classics, in his studies of the ammonoids of western Texas. 



The bulletin contains 241 pages of text, illustrated by 11 quarto 

 plates of halftones. 



Dr. Bose describes the following formations and new species, from 

 the base up, ranging from the base of the lower Permian to near the 

 middle of the upper Permian. 



i) WoLFCAMP FORMATION, with DaracHtes texanus, Uddenites schucherti, 

 Uddenites minor, Gastrioceras modestum, Schistoceras diverse- 

 costatum, Paralegoceras incertum, Agathiceras frechi, Marathonites 

 vidriensis, Marathonites sulcatus, Marathonites j. p. smithi, Vidrio- 

 ceras uddeni, Vidrioceras irregulare. 



2) Hess formation, with Prothalassoceras welleri, Marathonites hargisi. 



3) Leonard formation, with Medlicottia whitneyi, Gastrioceras altudense, 



Perrinites vidriensis, Perrinites compressus, Paralecanites altudensis. 



4) Word formation, with Medlicottia burckhardti, Gastrioceras roadense, 



Paraceltites multico status, Agathiceras girtyi, Adrianites mara- 

 thonensis, Stacheoceras bowmani, Stacheoceras gilliamense, Waagen- 

 oceras dieneri. 

 No. I is called the zone of Uddenites; No. 2, zone of Prothallassoceras; 

 No. 3, zone of Perrinites; No. 4, zone of Waagenoceras. 



On table I is given a correlation table of the Permo-Carboniferous 

 cephalopod-bearing beds of the world, and the position of the Texas 

 beds in the column. 



The previously known genera, Daraelites, Paralecanites, and 

 Adrianites are added to the American Permian fauna, and also a true 



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