Fauna in Columbia Co., New York. 413 



(D) 25. Diaphorostoma sp. n. In external ornament similar to D. Hneatum of 

 the Hamilton shales. 



26. Cyrtolites expansus ? (D) 27. Pleurotomaria sp. n. 28. Bellerophon sp. n. ? 



Pteropods. 29. Conularia sp. ? 30. Coleolus sp. ? 



(H) 31. Tentaculites cf. elongatus, Hall. A very large species differing, if at all, 

 from the Lower Helderberg form, in its coarser annulations. 



32. Tentaculites sp. n. A very slender form, covered with minute, equal and 

 closely crowded annulations. 



Pelecypods. (H) 33. Actinopteria cf. textilis, Hall. This shell is nearer to the 

 typical lower Helderberg species than to the var. arenaria occurring in the Hip- 

 parionyx-iaxxna. 



(H) 34. Aviculopecten of the type A. Schoharie, Hall, of the Shaly limestone, 

 but covered with radial ribs in addition to the very fine concentric lines. 



35. Megambonia bellistriata, Hall 36. M . lamellosa, Hall(?) 37. Goniophora 

 sp. n. (H) 38. Cypricardinia cf. lamellosa, Hall, of the Shaly limestone. 39. 

 Conocatdium sp. 



Brachiopods. 40. Lingula sp. 41. Orbicidoidea sp. 



42. Crania sp. n. A large shell with fine, rapidly bifurcating surface stria). 

 This is of the type of G. agaricina of the Shaly limestone, but larger and more 

 finely striate. Not uncommon. 43. Crania sp. n. A smooth species. 



44. Pholidops terminalis, Hall. This, and P. arenaria both of the Oriskany, are 

 probably but the exterior and the internal cast of the same species. 



45. Pholidops sp. n. A small species of the type of P. squamiformis. 

 (H) 46. Orthis perelegans, Hall, of the Shaly limestone. 



(H) 47. 0. cf. oblata. Hall of the Shaly limestone. A small form of this type. 

 48. 0. sp ? A small, subcircular species. 



(H) 49. Orthothetes cf. Woohvorthana, Hall, of the Shaly limestone. 



50. 0. sp. n. A small, very abundant shell, in size and expression suggestive of 

 0. lens, of the Choteau limestone, but more variable in form and contour. 



51. Hipparionyx proximus, Vanuxem. A single specimen of a very large and 

 typical brachial valve. 



52. Leptmna rhomboidalis, "Wilckens. The Lower and Upper Helderberg form, 

 rather than the Oriskany var. ventricosa. 



53. Stropheodonta Lincklasni, Hall. (H) 54. S. cf. radiata, Vanuxem. In 

 some of these shells the radial striae are sharp and strongly fasciculate, producing 

 an expression similar to that of S. deniissa of the Middle Devonian. 



55. S. sp. n. A. A large, strongly arcuate form with fine fasciculate striae, as in 

 Rafinesquina alternata. 



(D) 56. S. sp. n. B. A small convex form of the type of S. alveata of the 

 Schoharie grit. 



57. Leptostrophia magnifica, Hall. A small variety. 



(H) 58 L. cf. BecM, Hall. A perplane species with low, irregular, concentric 

 rugae extending to the anterior margin. The prevailing size of the shell is much 

 smaller than in the Lower Helderberg form. Very abundant. 



(D) 59. L. perplana, Conrad. Persistently more convex than the middle 

 Devonian form; the difference however is no more than varietal. Everywhere 

 abundant. 



(H D) 60. Strophonella cf. Headleyana, Hall, of the Shaly limestone. 



61. Vitulina ? If this identification, founded on a single internal cast, be correct, 

 this genus appears for the first time on this continent in its normal association 

 with a lower Devonian fauna, as in South America and Africa. 



(D) 62. Ghonetes sp. n. A small shell of the type of C. coronata, Conrad. 



63. Chonostrophia sp. n. Differs from G. complanta of the Oriskany in smaller 

 size, greater reversed convexity and distinct fasciculation of striae. 64. Anoplia 

 nucleata. Hall. 



65. Spirifer arrectus, Hall. This abundant species varies considerably in size 

 and plication and frequently suggests the Lower Helderberg S. cyclopterus. 66. 

 S. arenosus, Conrad. 67. S. pyxidatus, Hall. (H) 68. S. modestus, Hall, of the 

 Shaly limestone. 69. S. cf. ftmbriatus, Conrad. A sparsely ribbed, coarsely fimbria- 

 ted shell. Specific relations can not be more closely determined with the 

 material at hand. 



