umbe. ] CANADIAN PALAEOZOIC CORALS. 25 



septal spines, and near the calyces a longitudinal ridge is present on the 

 lower wall, whilst in some specimens indications of two longitudinal 

 ridges can be seen occupying the inner surface of the upper wall. Pores 

 numerous and placed at the angular sides of the corallites. Tabulae 

 complete. 



Found in the Corniferous limestone of Ontario. 



Alveolites vallorum, Meek. 



? Alveolites suborbicularis, Lamarck. 1816. Hist, des An. sans, vert., vol. II., p. 186. 

 ? Calamopora spongitcs, var. tuberosa, Goldfuss. 1829. Petrefacta Germanise, p. 80, pi. 



XXVIII, figs, la — e (cset. exclusis). 

 Alveolites vallorum, Meek. 1868. Trans. Chicago Acad, of Sciences, vol. I., p. 86, pi. 



XL, figs. 9, 9a. 

 ? Alveolites suborbicularis, Nicholson. 1879. Palaeoz. Tab. Corals, p. 126, pi. VI., figs- 



2, 2a— b. 

 Alveolites vallorum, Whiteaves. 1891. Contr. to Can. Palaeon., vol. I., pt. III., p. 

 207 ; and 1892, ibid, vol. I., pt. IV., p. 274. 



Corallum forming irregular expansions of considerable thickness with 

 a small basal attachment, upper surface generally uneven of variable 

 shape, under surface provided with an epithecal covering, somewhat flat, 

 at times showing rough concentric wrinkles marking successive stages of 

 growth, reaching a breadth of 5 or 6 inches with a thickness of about 

 1£ inch. Corallites moderately thin walled throughout their length, 

 flattened, wider than high, with a broadly arched upper wall and 

 generally doubly concave on the lower side, reaching the surface at a 

 somewhat oblique, but rather variable angle ; average size # 75 mm. wide 

 and *5 mm. high. Pores of fair size, about -2 mm. in diameter and *5 

 mm. apart, occurring in single rows near the two angular sides of the 

 corallites. Tabulae numerous, complete, from about eight to fourteen in 

 a space of 5 mm. Numerous small spiniform septa project from the 

 inner surfaces of the walls of the corallites ; these are only seen in very 

 well preserved specimens, either in polished sections or when the corallites 

 are free from matrix. A strong longitudinal ridge is present on the 

 lower surface of the calyces and extends apparently for a short distance 

 only into the interior of the corallites. At times the corallites appear to 

 radiate from a number of centres, with a consequent result that the coral- 

 lites in these specimens are rather unequal in size, and their obliquity to 

 the surface is variable. 



This species was described by Meek from specimens collected by 

 Robert Kennicott at the i{ Ramparts " on the Mackenzie River, forty 

 miles above old Fort Good Hope. Through the kindness of the author- 

 ities of the Smithsonian Institution, Washington, the writer has been 



