ORTMANN I TERTIARY INVERTEBRATES. 
295 
Eocene relations : 5 species = 7 per cent. 
Cucullcea alta. Psammobia patcigonica. ' Bulla patagonica. 
Crassatella kokeni. Fusus archimedis. 
Eocene and Oligocene relations : 1 species =1.5 per cent. 
Balanus varians. 
Oligocene relations : 7 species =10 per cent. 
Nucula patagonica. Mactra garretti. Martesia patagonica. 
Nucula reticularis. Corbida hatcheri. Borsonia patagonica. 
Cardita 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.). 
Cucullcea darwini (Eoc. & Plioc.). 
Cardium puelchum (Olig.-Rec.). 
Dentalium sulcosum (Olig., Mioc.). 
Scalaria rugulosa (Olig., Mioc.), 
Natica secunda (Olig., Mioc.). 
Vermetus intortus (Olig. -Plioc.). 
Aporrhais araucana (Olig.-Rec.). 
Miocene relations : 22 species = 32 per cent. 
Cidaris antarctica. 
Leda errazurizi. 
Ostrea ingens. 
Crassatellites longior. 
Venus chiloensis. 
Venus meridionalis. 
Venus darwini. 
Tellina jeguahisis. 
Pliocene relations : 
Melicerita triforis. 
Pecten prcenuncius. 
Recent relations : 3 
Toxopneustes precursor. 
Calliostoma pararatum. 
Calliostoma santacruzense. 
Calliostoma garretti. 
Turritella patagonica. 
Pyrula Carolina. 
Tritonium morgani. 
Buccinmn annoe. 
species = 6 per cent. 
Turritella ambulacrum. 
4 
species = 4 per cent. 
Heteropora pelliculata. 
Chrysodomus cancellatus. 
Fusus torosus. 
Terebra costellata. 
Pleurotoma subce qualis. 
Genota cuevensis. 
Drillia santacruzensis. 
Ac tee on semilcevis. 
Turritella breantiana. 
Liotia scotti. 
Neogene relations [Miocene— Recent) : 13 species = 19 per cent. 
Scutella patagonensis. 
Area. patagonica. 
Odontostomia suturalis. Natica subtenuis. 
Crucibulum dubiuni. Dolium ovulum. 
A 
