140 



Dr. Shumard says is " distinctly imjjressed "in the t}qDes from Texas, is 

 broad, shallow and obscure in the Sucia Island specimens, but these 

 latter are all more or less distorted b}' lateral compression. 



Anatina Trtoniana, (tABB. 

 Anatina Tryoniana, Gabb — Pal. Cal, Vol. I., p. 150, pi. 29, fig. 240. 



Lower Shales, Division B, at Gabriola Island ; J. Eichardson, 18*72. 

 One specimen with both valves preserved, but with a small portion of 

 the posterior end broken off". 



(Anatina quadrata, Gabb. 

 Anafiha quadrata, Gabb.— Pal. Cal., Vol. II., p. 177, pi. 29, fig. 64. 



*' From the gj^eenish rock on the north shore of Departure Bay, 

 Nanaimo, Vancouver Island; associated with Pecten Traskii, Trigonia 

 Evansana and other species characteristic of the Chico Cxi-oup of 

 California." Gabb. Possibly an elongated form of Thracia subtruncata, 

 Meek, but if not it has not been detected in any of Mr, Richardson's 

 collections.) 



Thracia subtruncata, Meek. 



Plate 17, figure 7. 



Thracia f subtruncata, Meek. — Trans. Alb. Inst., 1857, Vol. IV., p. 44. 



" « «< Bui. Geol. & Geogr. Surv. of Terr., Vol. 11., No. 4, p. 363, 



pi. 2, figs. 4 and 4fl. 



Nanaimo, V. I. Meek. Sucia Island.s, in Division A; .T.Richardson, 

 18t4. One tolerably good specimen. 



Pholadomya Eoyana, D'Orbigny. 



Pholadomya Rot/ana, D'Orbigny, — Pal. Franc, Terr Cret., Vol. III., p. 360, pi. 367. 



Pholadomya subelongaia, Meek. — Trans?. Alb. Inst., "357, Vol. IV., p. 41. 



" " —Bui. Geol. & Geogr. Surv. of Terr., Vol. II., No. 



4, p. 362, pi. 2, figs. 1 and \a. 



Pholadomya Brewern, Gabb. —Pal. Cal., Vol. I., p. 152, pi. 22, fig. 123. 



Nanaimo, V. I., and Newcastle Island. Meek. (P. suhelongata.) 

 Gabriola Island, in Division B (two specimens) ; Sucia Islands, in 

 Division A (one specimen) ; J. Richardson, 1872 and 1874. 



A critical comparison of the description and figures of P. Royana with 

 those of P. subelongaia has led to the conclusion that the two shells are 

 identical. Both have the same transversely elongated, slightly rurved 

 elliptical outline : the beaks of each are suljtcrminal, and the radiating 

 ribs of both are acute, and become neai-ly obsolete at the posterior and 



