CEPHALOPODA. 



Distribution, 3 species. Upper Triassic strata of Hallstadt, 

 Austria. 



V 



Fig. 8. Shell and sutnral lobes of Cochloccras Fischeri. 



4. Choristoceras, Hauer, 1865. 



Type, C. Marshii, Hauer. 



Shell somewhat similar in form to Crioceras, with the lobular 

 ornamentation characteristic of Ceratites. 



Distribution, 4 species. Upper Trias, Austria. 



5. Clydonites, Hauer, 1860. 



10 b 



Fig. 9. Shell of Clydonites co&tatus, Hau. Fics. 10a, 10b. Shell and sutural lobes of C. 

 delphinocepkalus, Hau. 



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



Examples, Goniatites Eryx, Miinst ; Ammonites delphino- 

 cephalus, Hauer. Pigs. 9, 10. 



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

 as in Ceratites. 



Distribution, Upper Triassic strata, Hallstadt and St. Cassia^ 

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

 Upper Cretaceous, 2 species described as Ceratites by D'Orbigny. 



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