platp: XX. 



Page. 

 Figs. 1-10. Schistocekas hy.vtti .Smith, sp. nov 104 



Figs. 1 and 2. Transitional from paralegoceran to schistoceran stage, diameter 21 nun.. 



twice enlarged. 

 Figs. 3 and 4. Karly adnlt, S('histiM/eran stage, iliameter 4(1 nnii., natural size, showing 



the surface of shell. 

 Figs. 5 and 6. Adult stage, diameter 43 mm., natural size. This was Hyatt's type of the 



genus Schistorcras. 

 Figs. 7 and 8. Ailult stage, diameter 67 mm., natural size. 



Figs. 9-11. Goniolobocer.a,s welleri Smith, sp. nov 125 



Adolescent, glyphioceran stage, diameter 7.5 mm., enlarged 5 times. 

 Figs. 12-15. Dimorphocer.\s te.xanum Smith, sp. nov. (The cross section, fig. 13, is ahout 



two-thirds natural size. ) 126 



Note. — All specimens on this plate from Upper Coal Measures, Cisco formation, (Traham, Young 

 County, Tex. 



188 



