WHITEAVE8.] DEVONIA^f FOSSILS, MACKENZIE RIVER BASIN. 199 



Zoatitharia under the heading " incerte sedis," and Zittel in his " Hand- 

 buch der Palffiontologie " (1883) quotes it in an appendix to the Zoan- 

 tharia under the title " Genres du Groupe des Tabulata et Tabulosa E. 

 and H. de position syst^matique incertaine." 



ZOANTHARIA. 



Streptelasma rectum, Hall. 



Plate 27, figs. 1, la"and 2. 



Sirombodes rectus, Hall. 3843. Geol. N. Y., Surv. Fourth Distr., pp. 209-210. 

 Cyathophylluni rectum, Edwards and Haime. 1851. Polyp, foss. Terr. Palseoz., I, 



p. 372. 

 Streptelasma recta. Hall. 1876. Illustr. Dev. Foss., pi. xix, figs. 1-13. 



Mackenzie Eiver, ten miles below Bear Eiver, E. G. McConnell, 1888 : 

 three specimens which seem to agree with the descriptions and figures 

 of this species. 



Ctathophtllum ARCTIC0M, Meek. 



Cyathophyllum arcticum, Meek. 1868. Trans. Chicago Ac. So., vol. I, p. 79, pi. xi, 

 fig. 8. 



Mackenzie Eiver, at the " Eam parts," E. G. McConnell, 1888: two 

 good specimens, which correspond fairly well with Meek's description 

 of one of the forms of this species. Mr. Meek, however, expressed the 

 opinion that C. arcticum " resembles C. quadrigeminum of Goldfuss, as 

 figured on pi. xviii, fig. 6b of his Petrefacta Germanite, more nearly 

 than any other species " with which he was acquainted. In the wri- 

 ter's judgment, the two specimens collected by Mr. McConnell are 

 much more like G. hexagonum, as originally described and figured by 

 Goldfuss, and subsequently by Edwards and Haime, the Sandbergers, 

 Perdinand Roemer and others, if, indeed, they are not actually identical 

 therewith. Both specimens are small convex masses of intimately con- 

 nected, polygonal and for the most part hexagonal corallites, the aper- 

 tures of the larger ones measuring as much as fifteen millimetres in 

 their maximum diameter. The number of septa is essentially the same 

 as those of G. hexagonum, but in the specimens from the " Eamparts " the 

 writer has not been able to detect any traces of the paliform lobes on 

 the septa, which, according to Edwards and Haime, " form a very dis- 

 tinct crown round the centre of the calice " in G. hexagonum. 



