420 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



PART 2. 

 Page 151. 



For "aucella mosquensis, var. concentrica," and the list 

 of its synonyms, sulistitute the following. 



Adcella crassicollis, Keyserling. 



Aucc/la crassicollis, Keyeerling. 184G. Reine in das Petschora-Land, p. 300, pi. 16, 



figs. 9-12. 

 Aucella Piochii, Gabb. 1869 {In part.) Palaeont. California, vol. II., p. 194, pi. 32 



fig». 92, a-r. 

 A^icflla Piochii, {(jabb) Whiteaves. 1882 (In part.) Trans. Royal 8oc. Canada, vol 

 I., sect. 4, p. 84. 

 ' " Whiteaves. 1884. (ieol. Surv. Canada, Mesoz. Fossils, vol. I., pt. 



3, p. 239. 

 /tucclln concentricd, (Fischer) White. 1884. Bull. U. S. Geol. Surv., No. 4, p. 13, pi 



6, figs. 2-12 : and (1885) Ihid., No. 15, p. 23. 

 v4u<;e/^a P(oo/in', (Gal:)b) Whiteaves. 1887 (In part. ) Geol. and Nat. Surv. Canada, Ann, 



Rep. N. S., vol. II., p. Ill A. 

 Aucella concentric^, (Fischer) White. 1889 (In part.) Mon. U. S. Geol. Surv., No. 13, 



p. 231, pi. 4, figs. 3-5, 11-17 and 21. 

 Aucella crassicollis and var gracilis, Ijahusen. 1888. Ueber Russischen Aucellen, pp. 



24 & 42, pi 5, figs. 8-16. 

 Aucella piriformis, Lahusen. 1888. [hid., pp. 24 & 42, pi. 5, figs. 1-7. 

 Aucella crassicollis, (Keyserling) Stanton. 1895. Bull. U.S. Geol. Surv., No. 133, p. 45, 

 pi. 5, figs. 1-13 ; and pi. 6, figs. 1-5. 



Since the publication of Lahusen's monograph on the Russian Aucellee, 

 it has become obvious that tbe specimens which are so abundant at many 

 localities in British Columbia, can no longer be regarded as varieties of A. 



concenlrica. 



Mr. Stanton, who has examined a series of specimens from that province, 

 expresses the opinion that the Aucelliefrom the Skagit River, collected by 

 Dr. G. M. Dawson, in 1877, are A. Piochii, var ovala, but that those from 

 all the other localities mentioned on pages 151 and 152 of this volume, 

 should be referred to A. crassicollis, Key.serling. All the Aucellas that 

 the writer has yet seen from Canadian localities are from a well-defined 

 horizon in the Earlier North American Cretaceous. 



Page 156. 



For " Placenticebas Perezianum " — read : 



Desmoceras Perezianum. 



And, add to the list of references : 



Desmrxeras Perezianum, Whiteaves. 1892. Trans. Royal Soo. Canada, vol. X., sect. 4, 

 ' p. 114. 



