230 CONTRIBUTIONS TO CANADIAN PALyEONTOLOQY. 



Rivei', firbt ten miles below the Clear Water, Di-. E. Bell, 1882; three 

 miles below the Calumet and thirty miles below Eed River, E. G. 

 McConnell, 1890. Pembina Eiver, four miles above its mouth, R. (i. 

 McCoiinell, 1890. Hay Eiver, forty miles above its mouth, E. G. 

 McConuell, 1887. Mackenzie Eiver, at the "Eamparts," and ten miles 

 below the "Eamparts,"' R. G. McConnell, 1888; apparently as com- 

 mon as the typical form at each of these localities. The occurrence of 

 this shell at the Ramparts and Fort Good Hope had previously been 

 recorded bj' Meek, and an unusually large and fine specimen of it, 

 which is now in the Survej^ collection, was collected by I'Abbe 

 Petitot in ]8'74 near Fort Good Hope. 



In the typical A. reticularis the radiating ribs are very fine and 

 numerous, so much so that in a large and well preserved specimen of 

 it from the Hay River, as many as 180 of them can be counted on the 

 front margin of the shell. According to l^rofessor Hall, in the Iowa 

 shells for which he proposed the name A. aspera, var. occtdentalis, the 

 surface is " marked by ten or twelve dichotomizing plications upon 

 each ^■alve," so that there would not be much more than twice those 

 numbers on iheir fi'ont margins. Professor Hall, however, states that 

 in this western variety " the number of plications is only about half as 

 many as in full grown specimens of the species in the shales of the 

 Plamilton group of New York." 



The I'easons which induced Dr. Davidson to concur with Hisinger, 

 LindstriJm, Brown and McCoy in regarding the A. aspera of Schlothoim 

 as a mere variety of A. reticularis, ai-e fully stated on page 57 of the 

 " British Devonian Brachiopoda." The numerous and perfect speci- 

 mens collected by Mr. McConnell on the Peace, Hay and Mackenzie 

 Rivers would seem to support thia conclusion, as most of them are 

 intermediate in their characters between A. reticularis proper and A. 

 aspera. The greater number of them, too, correspond much better 

 with Hall's descriptions and figures of the eastern shell which he has 

 called A. spinosa than with the western form of A., asvera, and in several 

 specimens fjom the Hay Eiver the comparatively fine radiating j'ibs 

 are distinctly spinose. 



Ehtnchonella I'UGNUS, .Martin. 



Conchyliolilhux anomitcs pv.gvun, Martin. 1809. Petref. Derb., tab. xxii, figs- 4,5. 

 Atrypa pvgnus, Sowerby. 1840. Geol. Trans., 2nd Ser., vol. v, pi. Ivi, figs. 15-18. 

 Tercbralula pugnus, Phillips. 1841. Pal. Foss. C'ornw., Dev. and W. Somers., p. 



87, pi. XXXV, figs. 156 a-e. 

 Tirubratula anisodorita, Phillips. 1841. lb., p. KG, pi. xxxiv, figs. 154 a-c. 



