CEPHALOPODA. 



Distrihidiony 3 species. Upper Triassic strata of Ilallstadt, 

 Austria. 



Fig. 8. Shell and sutoral lobes of Cochloceras Fischeri. 



4. CHomsTOCERAS, Hauer, 1865. 



Type, C. Marsliii, Hauer. 



Shell somewhat similar in form to Crioceras, with the lobular 

 ornam.entatioii characteristic of Ceratites. 



Distributio7i, 4 species. Upper Trias, Austria. 



6. Clydonites, Hauer, 1860. 



10 6 



Fig. 9. Shell of Clydonites costatus, Hau. Figs. 10a, 10b. Shell and sutural lobes of C. 

 delphinocephalus, Hau. 



Etymology, Mudon, the surge, with the usual termination. 



Examples, Goniatites Eryx, Miinst ; Ammonites delphino- 

 cephalus, Hauer. Eigs. 9, 10. 



Shell, discoidal ; sutures lobed ; lobes entire, not crenulated 

 as in Ceratites. 



Distribution, Upper Triassic strata, Hallstadt and St. Cassian, 

 in the Austrian Alps ; North-western Himalayas; 21 species. 

 Upper Cretaceous, 2 species described as Ceratites byD'Orbigny. 



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