220 



O, S. Grosser — Upper Hamilton and 



seems important to indicate more of the data upon which this 

 classification was based. The upper zone of the Hamilton 

 stage as exposed in the creeks and railroad cuts near Earlville, 

 Smyrna and Sherburne, which was called the "Sherburne 

 group " by Conrad, is composed of moderately coarse arena- 

 ceous shales which alternate with more argillaceous and calcare- 

 ous shales containing abundant fossils. Along Pleasant brook 

 above and below the Ontario and Western railroad station, in 

 the edge of Smyrna village, as well as farther up the brook 

 toward Upperville, are excellent exposures of these shales. 

 Various species are abundant and careful search would be 

 rewarded by a large list of Hamilton fossils. A moderate 

 search has afforded the writer the following species from along 

 Pleasant brook and other exposures near Smyrna village, Che- 

 nango county. 



1. Amboccelia umbonata (Con.) Hall i 34. 



___(aa)* | 35. 



2. Spirifera Jimbriata (Con.) Hall.. (cc) j 36. 



3. Tropidoleptus carinatus (Con.) Hall 37. 



. (aa)\ 



4. Chonetes coronata (Con.) Hall (cc) ; 38. 



5 . Chonetes deflecta Hall (?) (r) 39. 



6. Chonetes setigera Hal] (c) 40. 



7. Spirifera mucronata (Con,) Bill. .(c) 41. 



8. Spirifera medialis Hall (rr) ; 42. 



9. Spirifera granulifera Hall (a) 



10. Atrypa reticularis (Linn.) Dal (r) 43. 



1 1. Athyris sp ir if Oroides (Eaton) Hall (rr) , 44. 



1 2. Or this Vanuxemi Hall (rr) j 45. 



13. Strophodontaperplana(Qon.)~K&)l(rr) 46. 



14. Streptorhynchus chemungensis (Con.) 41. 



Hall _ (r) 48. 



1 5. Cyrtina hamiltonensis Hall (rr) j 49. 



1 6. Cryptonella planirostra Hall (rr) 



17. Chonetes scitula Hall (c) 50. 



18. Cimitaria recurva (Con.) Hall (rr) 



19. Paracyclas tenuis Hall (rr) 5 1 . 



20. Palceoneilo emarginata (Con.) Hall (r) 52. 



2 1 . Sch izodus appressus (Con. ) Hall . . (rr) 5 3 . 



22. Palceoneilo constricta (Con.) HalL(?-r) 54. 



23. Nuculites triqueter Con. (c) 55. 



24. Nuculites oblong atus Con (rr) 5G. 



25. Pholadella radiata (Con.) Hall . _.(r) 57. 



26. Orthonota (?) parvula Hall (rr) 58. 



2 7 . Prothyris lanceolata Hall (rr) 



28. Macrodon hamiltonice Hall (r) 59. 



29. Leda diversa Hall (rr) \ 60. 



30. Nucula bellastriata (Con.) Hall ..(rr) I 61. 



31. Microdon (Cypricardella) tenuistria- ! 62. 



tus Hall (rr) 63. 



32. Modiomorpha conccntrica (Con.) Hall ; 64. 



(rr)\ 65. 



33. Modiomorpha mytiloides (Con.) Hall , 66. 



---- (r)\ 



* The relative abundance of the species 

 abundant, a = abundant, cc = very common, 



Goniophora hamiltonensis Hall..(n*) 

 Goniophora rugosa (Con.) Hall..(?T) 

 Grammysia arcuata (Con.) Hall.-(r) 

 Modiomorpha subalata (Con.) Hall 



- [rr) 



Leptodesma Rogersi Hall(?) (rr) 



Pterinopecten Vertumnus Hall (c) 



Cypricardinia indenta (Con.) Hall (r) 



Modiella pygmaia (Con.) Hall (rr) 



Microdon ( Cypricardella) bellistriatus 



(Con.) Hall... .(rr) 



Grammysia constricta Hall (rr) 



Nucula lirata (Con.) Hall ..(rr) 



Orthonota carinata Con. (rr) 



Leda rostellata (Con.) Hall --(?"/') 



Palceoneilo muta Hall .(rr) 



Phthonia cylindrica Hall (rr) 



Mytilarca (Plethomytilus) oviformis 



(Con.) Hall - ---(*") 



Telli7iopsis subemarginata (Con.) Hall 



(rr) 



Pterinea flabella (Con ) Hall (rr) 



Cimitaria elongata (Con.) Hall ..(rr) 

 Phthonia sectifrous (Con.) Hall. _(rr) 

 Glytodesma erectum (Con.) Hall. (rr) 



Nucula corbuliform is Hall (rr) 



Phacops rana (Green) Hall (c) 



Dalmanites Boothi (Green) Hall. (rr) 

 Homalonotus BeKayi (Green) Em- 

 mons (rr) 



Platyceras carinatum Hall (rr) 



Pleurotomaria capillar ia Con. (r) 



Coleolus ienuicinctum Hall (rr) 



Bellerophon crenistria Hall (rr) 



Bellerophon Leda Hall (rr) 



Nucleosp ira concinna Hall (rr) 



Chonetes mucronata Hall (rr) 



Leiorhynchus multicosta Hall ...(rr) 



is indicated as follows : — aa = very 

 c = common, rr = very rare, r = rare. 



