377 



the Calciferous, -wliicli has not been recognized in Canada. It thus appears 

 that the L^vis formation not only lies above the Calciferous, but more than 

 2000 feet above it. Yet it holds a large number of trilobites of the Pots- 

 dam type, and several species, such as Lingula ManteUi, Camerella cdl- 

 cifera, Bathyurus Cordai, B. conieus, and Asaphus canalis, which cer- 

 tainly do occur in the Calciferous. 



In the foregoing general catalogue (ante pp. 366-370) there are 62 

 species placed in Division P. But if we exclude from that Division all the 

 species, except those collected at Cow Head, only those on the list on p. 

 375 properly belong to it. The others should be placed in Division N. 



10. Fossils from various Formations in the Silurian and Devonian Sys- 

 tems. 



PROTOZOA. 



Calathium Canadense. 



Fig. 351. Fig. 352. 



Pig. 351. — Calathium Canadense. A vertical section of a small specimen, showing the 



interior of the cup and the apertures of the radiating canals. 

 Fig. 352. — Jstylospongia prcemorsa. Vertical section of a specimen, copied from Roemee. 



Description. — Elongate, turbinate, expanding to the diameter of about 

 one inch in a height of one and a half inches at the base, then becoming 

 more nearly cyhndrical. The cup is about one-third the whole diameter, 

 and extends nearly to the base. The pores or canal-apertures are ovate, 

 about eight in six lines of the length of each vertical row, and two in one 

 line in the transverse rows. 



The specimen above figured has the cup empty, but does not show the 

 structure of the walls, even in a polished section. Another specimen, a 

 fragment three inches in length, shows, in a longitudinal fracture, that the 

 radiating canals curve downwards, in proceeding to the exterior. 



This species probably attained a length of four or five inches, but only 

 two fragments have been found. It difiers from 0. Fittoni (ante^ p. 211) 



