CRETACEOUS FOSSILS. 235 



THRACIA, Leach. ? T. OCCIDENTALS, Meek. 



? Thracia occidentalis, Meek; Trans, Alb. Inst., Vol. 4, p. 43. 

 Chico Group, Nanaimo, Vancouver Island. 



? T. SUBTRUNCATA, Meek. 



f Thracia subtruncata, Meek ; loc. cit., p. 44. 

 With the preceding. 



PHOLADOMYA, Sowb. P. SUBELONGATA, Meek. 



Pholadomya subelongata, Meek ; Tr. Alb. Inst., Vol 4, p. 42. 

 Chico Group, Nanaimo, Vancouver Island. 



P. BREWERII, Gabb. 



Pholadomya Brewerii, Gabb ; Vol. 1, p. 152, pi. 22, fig. 123. 

 Chico Group, Pence's Kanch. 



P. NASUTA, Gabb. 



Pholadomya nasuta, Gabb ; Vol. 1, p. 152, pi. 30, fig. 124. 

 Martinez Group, Martinez. 



P. OREGONENSIS, Gabb. 



Pholadomya Oregonensis, Gabb; Vol. 2, p. 178, pi. 29, fig. 65. 

 Chico Group, Siskiyou Mountains. 



GONIOMYA, Agas. G. BOREALIS, Meek. 



Pholadomya (Ganiomya) borealis, Meek ; Tr. Alb. Inst., Vol. 4, p. 41. 

 Chico Group, Nanaimo, Vancouver Island. 



PLEUROMYA, Agas. P. PAPYRACEA, Gabb. 



Pleuromya papyracea, Gabb ; Vol. 2, p. 178, pi. 29, fig. 66. 

 Shasta Group, Cottonwood Creek. 



ARCOMYA, Agas. A. UNDULATA, Gabb. 



Arcomya undulata, Gabb; Vol. 2, p. 179, pi. 29, fig. 67. 

 Chico or Shasta Group, Indian Creek, Butte County. 



