387 



Trigonia Evansana, Meek. 



Trigonia Evansana, Meek. 1857. Trans. Albany Inst., vol. iv, p. 42. 

 Trigonia Emoryi, Etheridge. 1861. In Hector's paper " On the Geology of the Coun- 

 try between Lake Superior and the Pacific Ocean," Quart. Journ. 



Geol. Soc. Lond., vol. xvii, p. 432; but not T. Eraoryi, Conrad, 



1857. 

 I, II Etheridge. 18(53. No. 40 of the list of specimens on p. 243 of Capt- 



Palliser's Official Report on his Explorations in British America in 



1857-60. 

 Trigonia Evansii, Gabb. 18G4. Geol. Surv. Calif., Palagoiit., vol. i, p. 189, pi. 25, 



fig. 17. 

 Trigonia Evansi, Meek. 1876. Bull. U. S. Geol. and Geogr. Surv. Terr, vol. ii, No. 4, 



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

 Trigonia Evansana, Whiteaves. 1879. This volume, pt. 2, p. 161 ; and (1896) Trans. 



Royal Soc. Canada for 1895, Second Series, sect, iv, p. 114. 



In 1876, in the second volume of the Bulletin of the United States 

 Geological and Geographical Survey of the Territories, Mr. Meek pointed 

 out that his Trigonia Evansana is "almost certainly the same shell that was 

 referred by Mr. Etheridge, among Mr. Hector's collections from Nanaimo, 

 to T. Emoryi Conrad (pi. lit, figs. 2 a, h, c, United States and Mexico 

 Boundary Survey Report.)" " It is, ho"wever," he says, " certainly very 

 distinct from that species, not only in form and in its decidedly less 

 crenate costse, but more particularly in having a smooth, longitudinally 

 sulcate, depressed ridge on each side of its escutcheon, not crossed by the 

 costne. Its cost?e are likewise less numerous and more prominent." 



In 1894, the Geological Society of London, through its president, Dr. 

 Henry Woodward, kindly lent to the writer for study, all the Cretaceous 

 fossils obtained during Captain Palliser's explorations, that were deposited 

 at Burlington House. These form the subject of a paper published in 

 1896, in the first volume of the second series of the Transactions of the 

 Royal Society of Canada. Among them were " ten specimens, mostly 

 mere casts of the interior of single valves, each labelled ' No. 40, Trigonia 

 Emoryi, Conrad ; below the lignite, Departure Bay, Nanaimo, Dr. 

 Hector, 18C0; collected by Mr. Mackay." These, as was expected, are 

 clfearly referable to T. Evansana. 



Meek's types of T. Evansana are both from Nanaimo, V.I., where they 

 were probably collected by Mr. T. J. Turner, of the U.S. Navy, in 1856. 

 On Vancouver Island, specimens of the same species were collected at 

 North West Bay by Mr. Richardson in 1873, and by Mr. Harvey in 

 1897 ; at Departure Bay, by Mr Harvey in 1901 ; and at Brennaa 

 Creek, near Wellington, by the Rev, G. W. Taylor in 1901. At the 

 Sucia Islands similar specimens were collected by Mr. Richardson in 1874 

 and by Dr. Newcombe in 1894. 



