240 The Ottawa Naturalist. [March 



annulated somewhat irregularly by well marked ridges and 

 constrictions and by minor ridges of growth, the whole outer 

 surfiice when sufficiently well preserved shewing fine, close-set, 

 transverse raised lines about twelve in the space of i mm. as 

 well as longitudinal septal striations ; type specimen 6 cent. 

 long, as measured on the convex curve, imperfect below where 

 the basal part, possibly about 3 or 4 cent, in length, has been 

 broken off. Calyx shallowly concave, smooth at the bottom 

 with the septa prominent on the margin and sides. Tabulae 

 broad, flat, usually bent down at the edge, close-set, forming a 

 definite central area a little over i cent, in breadth. Septa 

 rather crooked, of two lengths, the larger reaching the tabulae 

 and often encroaching on them, the smaller not quite half the 

 length of the larger ones, irregular, rather poorly defined, num- 

 bering in all about sixty. Vesicular zone outside the tabulae, 

 averaging about 5 mm. in breadth, made up of unequal, arched, 

 dissepiments directed upward and outward between the septa. 



Locality and formation. — Kennetcook, NovaScotia, collected 

 by Professor How ; lower Carboniferous formation ; one speci- 

 men belonging to the collection of the Redpath Museum 

 McGill University, Montreal. 



DiPHYPHYLLUM C.ESPITOSUM, Hall, sp. 



Diplophyllum aBspitosuni, Hall. 1852. Palaeont. New York, vol. 

 II. p. 116, pi. XXXIII, figs. I a-r. 



Cyathophyllum pelagicuvi, Billings. 1862. Geol. Surv. Canada, 

 Palseoz. Fossils, vol. I, p. 108. 



" pelagicuni, Billings. 1866. Geol. Surv. Canadp, 



Cat. Silur. Foss. Anticosti, p. 34. 



Diphyphyllum ccespitosum, Nicholson, 1875. Rep. Palaeont Prov. 

 Ontario, p. 59. 



Corallum aggregate, composed of upright, slender flexuou<«, 

 cylindrical corallites, increasing by lateral gemmation and 

 forming large colonies. Corallites varying in diameter from 

 about 5 to 8 mm., frequently touching each other, covered by 



