262 PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 



The most important contribution to the Patagonian fauna was made in 

 1897 by-z>. Ihering. Following Ameghino, who furnished the material, 

 v. Ihering distinguishes two marine horizons, the Patagonian and Supra- 

 patagonian (or marine Santacruzian) beds, a division, which is not ac- 

 cepted by us. For the present, however, we shall give the list of species 

 added to these faunas, as v. Ihering has given it. 



The following are the so-called Patagonian species added by him : 



1. Rhynchonella plicigera. 5. Pecten prcenuncius. 



2. Magellania globosa (M. lenticularis). 6. Mytilus cf, chorus. 



3. Bouchardia zitteli. 7. Venus volckmanni. 



4. Perna quadrisulcata. 8. Struthiolaria ameghinoi. 



All these 8 species are represented in our collections. A few more 

 species given by v. Ihering are to be dropped as synonyms (so Cucullcsa 

 dalli and multicostata = C. alta; Turritella argentina and steinmanni = T. 

 ambulacrum; Trophon laciniatus var. santacruzensis = T. patagonicus}. 

 Pecten patagonensis and Siphonalia cf. nodosa are very doubtful, and Tro- 

 phon varians has been dropped by v. Ihering himself in 1899. 



The following are the new Suprapatagonian species : 



1. Schizaster ameghinoi. 21. Eulima subventricosa. 



2. Area patagonica. 22. Odostomia suturalis (Odontostomia s.). 



3. Pectunculus puhinatus cuevensis (Glyci- 23. Turbonilla cuevensis. 



meris ibari). 24. Trochita magellanica (Jnfundibulum cly- 



4. Pecten centralis (P. proximus). peoluni), 



5. Modiola ameghinoi. 25. Natica consimilis. 



6. Crassatella longior (Crassatellites /.). 26. Natica subtenuis. 



7. Amathusia angulata. 27. Triton dautzenbergi. 



8. Venus striatolamellata ( V. navidadis). 28. Trophon pyriformis (Urosalpinx p.~). 



9. Cytherea splendida (Meretrix iheringf). 29. Trophon leucostomoides (Urosalpinx l^). 



10. Dosinia meridionalis. 30. Marginella quemadensis. 



1 1 . Tellina perplana. 3 1 . Marginella confinis. 



12. Tellina patagonica. 32. Marginella gracilior. 



13. Tellina jeguaensis. 33. Marginella plicifera. 



14. Mactra indistincta. 34. Valuta ameghinoi. 



15. Solen elytron. 35. Valuta patagonica. 



1 6. Glycimeris quemadensis (Panopea q.). 36. Cancel/aria ameghinoi. 



17. Pholas paucispina. 37. Cancellaria gracilis. 



1 8. Dentalium octocostatum (D. octocostellmn). 38. Pleurotoma discors (P. unifascialis). 



19. Fissurella sp. 39. enota Gcuevensis. 



20. Gibbula dalli. 40. Bulla,patagonica. 



