SELENARIIDiE. 83 



(4) Cretaceous. 



21. L. CLYPEiFORUis, If Orbignij (sp.) 



22. L. DOHA, B'Orhigny (sp.) 



23. L. Hagenowi, Bosquet. 



24. L. GoLDFUSBii, Hagenow. 



25. L. MiTRA, Hageiiow. 



26. C. MuNSTERi, Hagenow. 



27. L. SEMILUNARIS, Hagenow. 



28. L. SPIRALIS, Hagenow. 



29. L. BouRGEOisii, D'Orbigny. 



30. L. CKETACEA (?), Defrauce (? D'Orbigny). 



31. L. TUBERCULATA, U Orhigny . 



32. L. PAPYRACEA, B'Orbigny. 



33. L. REGULARis, If Orbigny . 



34. L. PETALOIDES, IfOrbigny. 



35. L. ROSACEA, IfOrbigny. 



36. L. PLANA, IfOrbigny. 



37. Stichopora clypeata, Hagenow. 



38. S. CONICA, IfOrbigny (? L, CONICA, Befrance). 



The following may be regarded as uncertain, either as to position or genus. 



39. L. SPONGIA (?), Morren. 



40. L. DucLOisii, iea; Claiborne, Alabama. 



41. L, BouEi, Lea; Claiborne, Alabama. 



42. L. QUINCUNCIALIS, Bujardiu. 



43. L. PiNEA (?), Risso ; Befrance. 



44. L. DEPRESSA (?), Conrad. 



From this list it will be at once apparent that the genus Lunulites preponderates very 

 greatly among fossil Selenariidse ; and, moreover, that with the exception of one species, 

 C. Miinsteri, noticed by Hagenow as occurring in the Cretaceous formation at Riigen, no 

 Cupularia is found before the Eocene period, in which again, there are but two at present 

 known, C. rhomboidalis, Miinst., C. Ilaid'mfjeri, Reuss., which are clearly not identical. 

 In the later Tertiaries, however, including the Crag, the number of Cupularice 

 is equal, or nearly so, to that of the Lunulites ; whilst in the recent period, the former 

 would appear to preponderate. It should also be remarked, that the recent Cupularice 

 not only exceed in number of species all the known fossil forms, but in size also, and that 

 superadded to them we have a distinct genus, Selenaria, probably more perfectly organised 

 than any. The recent Lunulites, also, though far fewer in number than their fossil con- 

 geners, would appear in like manner to exceed all, or nearly all of the latter, in their 

 development. The only fossil Lunulite apparently at all approaching in size some of the 



