WHiTEftVES.] DEVONIAN FOSSILS, MACKENZIE RIVER BASIN. 207 



forty miles above its mouth, E. G. McConnoU, 1887, and Mackenzie 

 Eiver, at the "Ramparts," R. G. McConnell, 1888. A few well pre- 

 served portions of branches of a coral which is somewhat doubtfully 

 referred to this species, from each of these localities. These vary in 

 thickness from half an inch to an inch and a half In some the coral- 

 lites are very small and in others comparatively large, but the lips of 

 the calices are invariably thickened by a secondary deposit of scleren- 

 chyma. Their apertures, which are often closed with opercula, are 

 usually nearly or quite circular in outline, but they vary considerably 

 in shape, those of one specimen, in particular, being transversely 

 elliptical, with an obtusely conical protuberance at the base of each. 



Lindstrom (Ovfersigt af Konigl. Yetensk. Akad. Porhandl., 1873, p. 

 22) and Ferdinand Roemer (Lethaea Geognostica, 1883, Bd. 1, p. 435) 

 claim that this species is the Madreporites cristatus of Blumenbach 

 (1803), and that the proper name for it is Pachypora crista'a, Blumen- 

 bach (Sp.). Edwards and Haime, on the other hand, had previously 

 identilied the Madreporites cristatus with a Wenlock limestone species, 

 and in this view they are followed by Nicholson in his "Tabulate 

 Corals of the Pateozoic Period." 



Alveolites vallorum. Meek. 



Alveolites vallorum, Meek. 1868. Trans. Chicago Ac. Sc, vol. I, p. 86, pi. xi, 

 fig. 9. 



Hay Eiver, forty miles above its mouth, E. G. McConnell, 1887, two 

 specimens; Mackenzie Eiver, at the "Eamparts," E. G. McConnell, 

 1888, four specimens; and Peace Eiver, at Vermilion Falls, E. G. 

 McConnell, 1889, one specimen. 



Alveolites Kcemeri, Billings. 



Alveolites Rremeri, Billings. 1860. Canadian .lournal, New Series, vol. V, p. 255. 



" " Nicholson. 1874. Rep. PaUeont. Prov- Ontario, p. 54. 



Cladopora Rcemeri, Rominger. 1876. Geol. Surv. Michigan, Foss. Corals, p. 50, 

 pi. XX, fig- 3. 



Peace Eiver, near Vermilion Falls, Professor Macoun, 1875, eleven 

 specimens, and E. G. McConnell, 1889, one fragment. 



