and A. Vancouvrretisis, also, has been fou id to be nothing more than an 

 obliquely distorted specimen of A. Tuscina, 



Trigonia Evansana, Meek. 



Trigonia Evamana^ Meek. — Trans. Alb. Inst., Vol. IV., p. 42. 



Trigonia Evansii Gabb, as of Meek.— Pal. Cal., Vol. I., p. 189, pi. 25. fig. 177. 

 Trigonia Evansii, Meek. — Bui. Geol. and Geogr. Smv. of Terr., Vol. II., No. 4 



p. 359, pi. 2, figs. 7, la and 76. 



"Cretaceous beds at Nanai mo, Vancouver's Island. " Meek. North- 

 west Bay, Y.I., seven or eight specimens with the shell presei'ved, also 

 at the Sucia Islands, a few casts, with portions of the exfoliated test 

 attached ; both in Division A ; J. Richardson, 1872 and 1874. 



Trigonia Tryoniana, Gabb. 



Plate 18, figure 7. 

 Trigonia Tryoniana, Gabb.—Fa\. Cal., Vol. I., p. 188, pi. 25, fig. 176. 



North-west Bay, V.I., in Division A; J. Richardson, 1872. The only 

 specimen yet obtained, which is represented in the figure, is a tolerably 

 perfect 'and well preserved left valve of a local variety of T. Tryoniana, 

 in which the oblique series of tubercles are unusuall}^ numerous and 

 closely disposed. 



NUCULA PECTINATA (?) SOWERBY. 



Plate 18, figure 8. 



Nuculapectinata, Soicerhy. — Min. Coneh., Vol. II., p. 207, pi. 192, figs. 6 and 7. 

 Nucula peclinata, Mantell. — Geol. of Susse.x, pi. 19, figs. 5 and 9. 



Nuculapeclinata, UOrbigny. — Pal. Franc., Terr. Cret. Vol. III., p. 178, Atlas, pi. 303, figs. 



8-14. 



Lower part of the Trent River, in Division B; J.Richardson, 1871. 

 A distorted left valve, whose surface has been pressed down on, and its 

 margin strongly indented by, a large fragment oi Entalis Cooperi which 

 lies obliquely under it. The crowded radiating ribs of this specimen are 

 in every respect similar to those of N. jyectiiiata, and due allowance being 

 made for the distortion of the former, the shape of the two shells is also 

 very nearly alike, though the beaks of the Trent River shell are placed a 

 little farther from the posterior end than they appear to be in Sowerby's 

 species. In Woodward's "Manual of the Mollusca," page 2G9, it is stated 

 that the umbones of shells of the genus JSucula are "turned towards 

 the short posterior side," and hence it would seem that the excavated 

 space which D'Orbigny calls the lunule of N. pectinata, is really the 

 posterior area or escutcheon. 



