WHITEAVES.] DEVONIAN rOSSILS, MACKENZIE RIVER BASIN. 229 



ler size, but also in the fiict that theii- front mai-gins are mucli more 

 distinctly sinuated. From Ohio sijecimens of A. vittata, such as those 

 described and figured by Prof. Hall, the specimens from the Athabasca 

 differ also in their much smaller size and in the circumstance that the 

 mesial fold and sinus of each are more roanded and do not extend 

 nearly as far backward. 



Atrypa reticularis, L. 



For a complete list of synonyms of this species see Davidson's " Monograph of 

 the British Devonian J5rachiopoda,'page 53, the same authors 

 "British Silurian Brachiopoda," p. 129, or Hall's Paleonto- 

 logy of the State of New York, vol. IV, pt. 1, p. 316. 



Peace Pdver, at Vermilion Falls, R. G. McConnell, 1889. Athabasca 

 River, from the mouth of the Clear Water to about twenty five miles 

 below that stream, and thirty miles below Red Eiver; A. S. Cochrane, 

 1881, Dr. R. Bell, 1882, and R. G. McConnell, 1890. Bast side of Clear 

 Water Eiver, five miles below the Pembina, Prof Macoun, 18*75. Hay 

 Eiver, forty miles above its mouth, E. G. McConnell, 1887. Macken- 

 zie River, at the " Ramparts,'' and at Grand View, forty four miles below 

 the " Ramparts," R. G. McConnell, 1888. Apparently abundant at 

 each of these localities. The species had previously been collected by 

 Me>srs. Kennicott and Macfarlane on the Mackenzie River at the 

 " Ramparts " and near Fort Good Hope. 



Atrypa reticularis, var. aspera, 



Terebratula aspera, Schlotheim. 1820. Petrefact, p. 263, t. xviii, fig. 3. 



Atrypa aspera, Dalman. 1827. Vet. Akad. HandL, t. iv, fig. 3. 



Atrypa reticularis, var. aspera, Davidson. 1864. Brit. Dev. Brach., p. 57 (which 



see for a full list of synonyms of this shell), pi. x, ligs. 5-8. 

 Atrypa aspera, va.r. occidentalis. Hall. 1858. Geol. Iowa, vol. I, pt. 2, p. 515, pi. 



vi, figs. 3a, b, c, d. 

 Atrypa spinosa, Hall. 1843. Geol. Rep. Fourth Distr. N. Y., p. 200, figs. 1 



and 2. 

 Atrypa duraosa, Hall. Ibid., p. 271, fig. 1- 

 Atrypa spinosa, vel. A. aspera, Hall. 1867. Pal. N. Y., vol. IV, pt. 1, p. 322, pi. 



liii.A, figs. 1-14, 18, 24 and 25. 

 Atrypa aspera, Meek. 1868. Trans. Chicago Ac. Sc, vol. I, p. 96, pi. xiii, 



fig. 12. 



Peace Eiver, at Vermilion Falls, R. G. McConnell, 1889. Athabasca 



May, 1891. 



