CANADIAN PALAEOZOIC CORALS. 



165 



dehors, et indiquees par un bourrelet circulaire peu prononce qui circon- 

 scrit un calice un peu profond et dont le diametre fait a peu pres la moitid 

 de la grande diagonale des polygones. Une quarantaine de rayons cloi- 

 sonnaires, minces, droits, qui commencent a la muraille epithecale, et dont 

 la moitie seulement traverse la muraille interieure et atteint jusque pres 

 du centre en presentant un petit lobe paliforme. Dans une coupe hori- 

 zontale ou dans un etat de fossilisation que nous avons repr^sente" dans la 

 fig. 46, la muraille interieure est bien prononcee. Les traverses sont 

 serrees dans Faire comprise entre les deux murailles. Grande diagonale 

 des polygones, 10 a 12 millimetres ; diametre des calices, 4 ou 5. 



"Devonien. France: Ferques. Etats-Unis : Jeffersonville, Ohio Falls." 

 (Milne- Ed wards and Haime.) 



A specimen of an astrseiform coral, bearing the name of this species, in 

 the collection of the Geological Survey, was collected by A. Murray in 

 1866, in the Corniferous formation near Woodstock, Onario. 



In the form and structure of the corallites this specimen agrees with 

 the above description : the septa number from forty-four to forty-eight, 

 are thin throughout their length, carinated on their sides and alternately 

 long and short, the longer reaching the centre, with their ends twisted 

 together, the shorter a little more than half the length of the long ones. 

 A pseudo inner-wall, seen in horizontal sections, and a well marked 

 feature in the calyces, is formed by the sudden stoppage of the interseptal 

 dissepiments near the proximal ends of the shorter septa. The small 

 circular openings in the dissepiments between the septa noticed in speci- 

 mens of Phillipsastrcea Billing si, Calvin, and P. Verneuili, Milne- 

 Edwards and Haime, are also seen in this specimen ; they tend to 

 strengthen the belief in the close relationship of the genera Phillipsastrcea 

 and Acervularia. 



Genus Phillipsastrcea, d'Orbigny. 1849. 



Phillipsastrcea, d'Orbigny. 1849. Note sur des Polypiers fossiles, p. 2. 



Corallum composite, with an epitheca covering the basal surface. In- 

 crease by marginal calycinal gemmation. Corallites confluent, not bound- 

 ed by a definite wall. Calyces horizontally expanded at the margin, 

 with a central pit surrounded by an exsert rim. Tabulae often forming a 

 narrow axial area. Septa confluent with those of neighbouring corallites, 

 sometimes carinated, of two sizes, the primaries reaching the centre of the 

 visceral chamber. Dissepiments filling the interseptal spaces. A pseudo- 

 inner wall is suggested by the sudden stoppage of the secondary septa, 



