72 



NEW YORK STATE MUSEUM 



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

 sils, 51-52, 54-56. 



Miircliisonia, 50. 

 intercedens, 42. 

 turricula, 49. 



Myrtillocrinus americanus, 43. 



Mytilarca OYiformis, 47, 49, 51. 



Naples fauna, term, 60. 

 Naticopsis compacta, 42. 

 Nautilus liratus, 45. 



cf. magister, 45. 

 Nepliriticeras bucinum, 45. 

 Nucleocrinus lucina, 46, 49, 52, 55. 

 Nucleospira concinna, 48, 49, 51, 53, 

 55. 

 mut. pygmaea, 58. 

 Nucula corbuliformis, 53, 54. 

 uvut. pygmaea, 57. 

 lirata, 54. 



?7M<#. pygmaea, 57. 

 varicosa miit. pygmaea, 57. 

 Nuculites oblongatus, 44, 46, 47, 49, 

 53, 54. 

 milt, pygmaeus, 57. 

 triqueter, 53. 



milt, 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. 



Oriskanian group, 6. 



Oriskany sandstone, 6, 11-12; thick- 

 ness, 11; fossils, 40-41. 



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. 



fllosum, 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. 

 milt, pygmaeum, 57. 



thoas, 42. 

 Orthonota carinata, 54, 55. 



parvula, 54, 55. 



undulata, 54, 55. 

 Orthothetes arctostriatus, 46, 48, 

 54. 



bellulus, 53. 



chemungensis, 46, 64. 

 pectinaceus, 53. 



pandora, 43, 49, 54. 

 Ostracoda, 48, 50, 52. 



Palaeochaeta, 35. 



salicifolia, 63. 

 Palaeocreusia devonica, 42. 

 Palaeoneilo constricta, 49, 50, 53, 

 mut. pygmaea, 57. 



emarginata, 49, 50. 



fecunda, 49, 50, 51. 



muricata, 61. 



muta, 51. 



petila, 61. 



plana, 49, 50, 51. 

 milt, pygmaea, 57. 



tenuistriata, 49, 50, 51, 54. 

 Palaeonlscus devonicus, 62. 



sa^ 



54. 



