INTRODUCTION. 



The description of the fauna of the upper cretaceous strata completes the 

 first volume of series xvi, and it may safely be said that the species deserihed on 

 the following pages are of special interest, inasmuch as they shed quite a new 

 light on the geographical distribution of the upper cretaceous fauna. 



The following description includes 77 species, but it is quite certain of course 

 that this number does not include the entire fauna of the uppermost cretaceous beds 

 in Baluchistan. Our knowledge of the geology of that country is in its infancy, 

 and it is more than probable that with the increase of our knowledge of it, more 

 forms will be added to those described here. However, they are quite sufficient to 

 admit of some general conclusions being drawn. The following species were identi- 

 fied : 



1. Oriitolites macropora, Defrance. 



2. Orbitoides socialis, Leymerie. 



3. Trochogmilia jprotectans, spec. nov. 



4. CfcloUtes medlicotti, spec. nov. 



5. „ regularis, Leymerie. 



6. Cidaris suleimani, spec. Dov. 



7. OrUopsis perlata, spec. nov. 



8. Cyphosoma, spec. 



9. Frotechinus pauciiuiereulalm, spec. nov. 



10. Echinoconus gigas, spec. nov. 



11. Holectypm haluehistanensis, spec. nov. 

 ISJ. Vyrina ataxensis, Cotteau. 



13. 11 gigantea, spec. nov. 



14. Bchinanthus grieshachi, spec nov. 



15. Cyclolampas helios, spec. nov. . 



16. „ vishtm, spec. nov. 



17. Hemipnemtes pyrenaicus, Hebert. 



18. „ leymeriei, Hebert. 



19. J, compressus, spec. nov. 



20. Hemiaster hlanfordi, spec. nov. 



21. „ oldhami, spec. nov. 



22. Ostrea aciitiroatris, Nilsson. 



23. ,, pectinata, Lamarck. 



24. „ tingulaia, Schlotheim. 



25. Gryphcsa vesicularis, Lamarck. 



26. Exogyra pyrefiaica, Leymerie. 



27. Spondylus santoniensis, d'Orbigny, 



28. ,, spec, indet. 



