ORTMANN : TERTIARY INVERTEBRATES. 



295 



Eocene relations: 5 species = 7 per cent. 



Cuculliza alta. 

 Crassatella kokeni. 



Psammobia patagonica. 

 Fusus archimedis. 



Bttlla patagonica. 



Eocene and Oligocene relations: \ species =1.5 per cent. 



Balanus varians. 



Oligocene relations: 7 species = 10 per cent. 



Nucula patagonica. 

 Nucula reticularis. 

 Cardita patagonica. 



Mactra garretti. 

 Corbula hatcheri. 



Martesia patagonica. 

 Borsonia patagonica. 



This gives the sum of all Eogene relations (Eocene and Oligocene, but 

 not passing up into the Neogene) as 13 species = 18.5 per cent. 



Intermediate (Eogene as well as Neogene] species : 8=12 per cent. 



Cellaria fistulosa (Olig.-Rec.). Scalaria rugulosa (Olig., Mioc.). 



Cucullcea darwini (Eoc. & Plioc.). Natica secunda (Olig., Mioc.). 



Cardium puclchum (Olig.-Rec.). Vermetus intortus (Olig. -Plioc.). 



Dentalium sulcosum (Olig., Mioc.). Aporrhais araucana (Olig.-Rec.). 



Miocene relations: 



Cidaris antarctica. 

 Leda errazurizi. 

 Ostrea ingens. 

 Crassatellites longior. 

 Venus chiloensis. 

 Venus meridionalis. 

 Venus darwini. 

 Tellina jeguaensis. 



22 species = 32 per cent. 



Calliostoma pararatum. 

 Calliostoma santacruzense . 

 Calliostoma garretti. 

 Turritella patagonica. 

 Pyrula Carolina. 

 Tritonium morgani. 

 Buccinum anna. 



Pliocene relations : 4 species = 6 per cent. 



Melicerita triforis. Turritella ambulacrum. 



Pecten prcenuncius. 



Recent relations : 3 species = 4 per cent. 



Toxopneustes precursor. Heteropora pelliculata. 



Chrysodomus cancellatus. 

 Fusus torosus. 

 Terebra costellata. 

 Pleurotoma sub&qualis. 

 Genota cuevcnsis. 

 Drillia santacrusensis. 

 Actaon semil&i'is. 



Turritetla breantiana. 



Liotia scotti. 



Neogene relations (Miocene- Recent] : 13 species = 19 per cent. 



Scutella patagonensis. Odontostomia suturalis. Natica subtenuis. 



Area patagonica. Crucibulum dubium. 



Dolium ovulum. 



