72 



NEW YORK STATE MUSEUM 



Moscow shale, 6, 18, 21-23, 25; fos- 

 sils, 51-52, 54-56. 



Mnrchisonia, 50. 

 intercedens, 42. 

 turricula, 49. 



Myrtillocrinus americanus, 43. 



Mytilarca oviformis, 47, 49, 51. 



Naples fauna, term, 60. 

 Naticopsis compacta, 42. 

 Nautilus liratus, 45. 



cf. magister, 45. 

 Nephriticeras bucinurn, 45. 

 Nucleocrinus lucina, 46, 49, 52, 55. 

 Nucleospira concinna, 48, 49, 51, 53, 

 55. 



mut. pygmaea, 58. 

 Nucula corbuliformis, 53, 54. 

 mut. pygmaea, 57. 

 lirata, 54. 



mut. pygmaea, 57. 

 varicosa mut. pygmaea, 57. 

 Nuculites oblongatus, 44, 46, 47, 49, 

 53, 54. 

 mut. pygmaeus, 57. 

 triqueter, 53. 



mut. pygmaeus, 57. 

 Nyassa arguta, 53. 

 elliptica, 43. 



Octonaria stigmata, 52. 

 Oenonites, 47. 

 Olive shale, 56. 



Onondaga limestone, 6, 12-14; thick- 

 ness, 12; fossils, 41-44. 



Ontaria, 31. 

 affiliata, 61. 

 clarkei, 61. 

 halli, 61. 



suborbicularis, 59, 60, 61. 



Ontario county, geologic map, 4. 



Onychochilus nitidulus, 45. 



Onychodus sigmoides, 42. 



Orbiculoidea, 26, 35, 40, 63. 

 lodensis, 58, 59. 

 minuta, 46. 



Oriskanlan group, 6. 



Oriskany sandstone, 6, 11-12; thick- 

 ness, 11; fossils, 40— U. 



Orthis infera, 64. 



Orthoceras, 31, 50. 

 sp. und., 52. 

 aegea, 45. 

 atreus, 59. 

 caelamen, 51. 

 crotalus, 48, 54. 

 emaceratum, 54. 

 eriense, 45. 

 exile, 48, 51, 54. 

 fenestrulatum, 45. 

 filosum, 61. 

 geneva, 42. 

 inoptatum, 42. 

 marcellense, 45. 

 nuntioides, 46. 

 nuntium, 48, 51, 54, 57. 

 Ontario, 61. 

 pacator, 61, 62, 

 profundum, 42. 

 sceptrum, 42. 



scintilla (?) mut. mephisto, 57. 

 staffordense, 45. 

 subulatum, 44, 45. 



mut. pygmaeum, 57. 

 thoas, 42. 

 Orthonota carinata, 54, 55. 

 parvula, 54, 55. 

 undulata, 54, 55. 

 Orthothetes arctostriatus, 46, 48, 53, 



54. 



bellulus, 53. 

 chemungensis, 46, 64. 



pectinaceus, 53. 

 pandora, 43, 49, 54. 

 Ostracoda, 48, 50, 52. 



Palaeochaeta, 35. 



salicifolia, 63. 

 Talaeocreusia devonica, 42. 

 Palaeoneilo constricta, 49, 50, 53, 54. 

 mut. pygmaea, 57. 



emarginata, 49, 50. 



fecunda, 49, 50, 51. 



muricata, 61. 



muta, 51. 



petila, 61. 



plana, 49, 50, 51. 

 mut. pygmaea, 57. 



tenuistriata, 49, 50, 51, 54. 

 Palaeoniscus devonicus, 62. 



