1899] Lambe— Canadian Paleozoic Corals. 221 



covered by an epitheca regularly striated longitudinally by septal 

 furrows. Calyces not observed. Septa from eighteen to twenty- 

 two in number alternately long and short, the former passing to 

 the centre and producing a slender columella, the latter extend- 

 ing only a short distance inward from the wall. Frequently a 

 primary septum instead of passing to the centre joins the one 

 next to it at a short distance from that point A narrow peri- 

 pheral area formed of small upwardly and outwardly arching plates 

 in one or two cycles surrounds a broad tabulate inner zone. 

 Tabulae flat or slightly raised at the centre where they are crossed 

 by the columella, about fifteen occurring in a space of 5 mm. 



This species resembles Lithostrotion {Stylaxis) irregularis, 

 McCoy* from the Carboniferous limestone of Derbyshire but 

 the corallites are smaller, the septa are less numerous and there 

 are fewer rows of vesicles. 



Locality and formation. — Fossil Point, Peace River, British 

 Columbia, two fragments probably belonging to the same speci- 

 men, collected by Professor J. Macoun in 1875 ) lower Carboni- 

 ferous formation. 



ACERVULARIA GRACILIS, Billings, sp. 



Strombodes gracilis, Billings. 1862. Palaeozoic Fossils, vol. i, p 



113, fig- 94- 



Original description. — " Corallum in large masses, consist- 

 ing of cells from 2 to 3 lines in diameter, most of them pen- 

 tagonal. Cup about one line in depth, with an irregularlyrounded 

 central style \ line in height, and one-third or one-half the 

 whole width of the corallite. There appear to be thirty or 

 forty septal strife on the inner side of the cup." 



The figure on p. 113 of the above quoted work represents 

 about one-fourth of the surface of the only specimen of this 

 species in the collection. The specimen is silicified and not 

 preserved as well as might be desired but by a careful examination 

 of natural longitudinal and transverse sections the structure can 



*Brit. Palseoz. Fossi's, 1855. p. loi, pi. 3A, fig. 5. 



