WHITEAVE6.] DEVONIAN rOSSILS, MACKENZIE mVER BASIN. 203 



the specimens from the Hay Eiver. In all four there is no satisfactory 

 evidence of the existence of "infundibuliform cups," but the internal 

 structure, as represented in fig. 6, consists of a broad central tabulate 

 area surrounded by an outer and rather narrow peripheral zone com- 

 posed of large vesicles. The tabulate ai-ea occupies about three fifths 

 of the entire diameter, the tabulae are close-set, flat and for the most 

 part continuous, and their outer terminations are bent abruptly down- 

 ward. In the outer vesicular zone the general direction of the rows of 

 vesicles in the interseptal loculi is upward and outward. A transverse 

 section of the specimen represented by fig. 6, made at a distance of 

 about half an inch from the bottom of the cup, shows that the primary 

 septa reach nearly if not quite to the centre, and the secondary ones a 

 quarter of the way. 



In their description of Chonophyllum ellipticum Professors Hall and 

 Whitfield say that "there maybe some doubt as to its generic rela- 

 tions.'' If the specimen from Eockford, forwarded by Dr. Griffiths, be 

 correctly referred to that species, its internal structure would seem to 

 show that it is congeneric and even perhaps conspecific with the 

 Campophyllum Soetenicum of Schluter,* from the Middle Devonian of 

 the Eifel. 



A single specimen of a rather elongated and narrow variety of this 

 species has since been collected (in 1890) on the Athabasca, thiity 

 miles below Eed Eiver. 



Heliophtllum parvulum. (N. Sp.) 



Plate 27, figs. 9, 9a and 10. 



Corallum small, simple, either nearly straight, subconical and not 

 much longer than broad, as in the specimen represented by fig. 9, or 

 somewhat bent, irregularly distorted in growth and proportionately 

 rather narrower, as in the original of fig. 10, but apparently never 

 either slender or narrowly elongated. Calyx circular in outline, mode- 

 rately deep : septa thirty-six of each kind, at least in the broader of 

 the two specimens figured, their edges, as seen in the cup, presenting 

 a toothed appearance, which is due to the passing over them of arched 

 carina: primary septa reaching nearly to the centre at the bottom of 

 the cup: secondary septa very short and feebly developed: septal 

 fossette lateral, shallow. Epitheca thin, transversely striated and 



• Anthozoen des Rheinischen Mittel-Devon, Berlin, 1880, p. :«, taf . iii., figs. 1-6. 



