ORTMANN I TERTIARY INVERTEBRATES. 



J x Scutclla patdgonensis. 

 J Rhynclwnella plicigcra. 

 J x Terebratella patagonica. 

 L Perna quadrisulcata. 



5. L & S x Ostrea ingens. 



6. J & S x Pecten geminatus. 



7- -S Liicina promaucana. 



i. 



2. 



3- 

 4- 



8. P Cardium puelclmm. 



9. 5 Amathusia angulata. 

 I O. S x Scalaria nigulosa. 



11. L x Turritella ambulacrum. 



12. 5 x Struthiolaria ameghinoi. 



13. J Siphonalia noachina. 



This fact is the more important since just these species belong to the 

 most striking and characteristic features of this series, especially those 

 marked x. 



Finally, I offer here a list of the so-called characteristic species of 

 Juliense, Leonense, and Suprapatagonian beds, which have been found 

 associated in one and the same block : 



Darwin Station, San Julian: 



J & S Pecten geminatus J Pecten prcenuncius. 



Mouth of Santa Cms River: 



Block i : 6" Area patagonica. 



J Pecten prcenuncius. 



J Terebratella patagonica. 



S Area patagonica. 

 Block 4: P Cardita incequalis. 

 Block 5: 5 Cucull<za darwini. 

 Block 6a: . Area patagonica. 

 Block 6b: S Area patagonica. 



Block 2 

 Block 3 



L Turritella ambulacrum. 

 S Dosinia meridionalis. 

 S Amathusia angulata. 

 L Stnithiolaria ornata. 

 S Dosinia meridionalis. 

 L Turritella ambulacrum. 

 L Turritella ambulacrum. 

 P Cardita incequalis. 



L Struthiolaria ornata. 

 S Struthiolaria ameghinoi. 

 S Marginella plicifera. 



S Struthiolaria ameghinoi. 



Other instances, where Suprapatagonian species not recorded under 

 the characteristic forms are found (at Santa Cruz) associated in the same 

 block with Patagonian,- are the following: 



Block 7: 6" Leptothyra pltilippii (Cossm.). L Turritella ambulacrum. L Strutluolaria ornata. 

 BlockS: S Leptothyra philippii. L Turritella ambulacrum. 



Block 9: 5 Btilla patagonica (v. Ih.). J. Terebratella patagonica. 



Leptothyra philippii is also found in block 5, Bulla patagonica in block 

 i, 2 and 4. Nucula patagonica (P) is in block 6b. 



Mt. of Observation : 



Block i o: -S Modiola ameghinoi. 



Arroyo Gio : 



Block 1 1 : J & S Pecten geminatus. 



P Cardita incequalis. 



S Dosinia meridionalis. L Turritella ambulacnim. 



