""=E- ] CANADIAN PALAEOZOIC COEALS, 45> 



and also that between G. Canadensis and C. Anticostiensis interaiediate 

 forms exist connecting these two species. In the specimens from East 

 Selkirk, Manitoba, particularly, a gradual transition can be traced from 

 those specimens, structurally identical with either C. Canadensis or C. 

 Huronensis, in which the corallites are in contact and polygonal, to those, 

 indistinguishable from C. Anticostiensis, in which the corallites are even, 

 perhaps slightly farther apart than in the type specimen of that species. 

 On the evidence of these specimens the writer has been forced to regard 

 G. Canadensis, G. Huronensis and C. Anticostiensis as belonging to the- 

 same species, no constant structural or other difference having beea 

 found that would justify their being kept separate. 



Genus SYRiNGOiiiTES, Hinde. 1879. 



(Geological Magazine, decade II., vol. VI., p. 244.) 



Corallum broadly expanding, composed of upright, contiguous polygonal 

 corallites, with walls perforated by two or three longitudinal rows of pores ;. 

 tabulae funnel-shaped, invaginated and open below so as to form a con- 

 tinuous tube occupying the centre of each corallite ; septa represented by 

 numerous tubercles or short spines irregularly disposed on the inner sur- 

 face of the walls of the corallites ; calyces equal, polygonal, of moderate 

 depth. 



Stringolites Huronensis, Hinde. 



Svringolites Huronensis, Hinde. 1879. Geological Magazine, decade II., vol. VI.„ 

 p. 246, figs. A, B, C, D. 

 „ „ Nicholson. 1879. Palasoz., Tab. Corals, p. 179, fig. 27. 



Corallum growing in broad, thick expansions, and according to the 

 author of the species, with a basal epitheca ; the only specimen in the 

 collection has a maximum breadth of over 4 inches with a thickness 

 of about 1 inch, it is slightly convex above and flat below. Corallites 

 upright, polygonal, generally with five, six or seven sides, in close conr 

 tact, thin walled, with an average diameter of 2-5 mm. and placed in 

 communication with each other by mural pores. Tabulas funnel-sha,ped', 

 sloping backward toward the centre, where they become tubular, and 

 remaining open below, each tabula connects with the preceding one so as 

 to form a continuous tube, nearly 1 mm. wide, occupying the centre of 

 the corallite; from eight to ten tabulae occur in a space of 5 mm. 

 Pores rather small, in two or three rows in the sides of the corallites. 

 Septa small, spiniform, present in large numbers, apparently without 

 definite order, on the inner surface of the walls of the corallites ; spines 

 similar to these in size and shape and equally abundant oscur on the 

 upper surface of the tabulae and extend into the tube. Calyces rather 



