64 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



locality as well as from the vicinity of Owen Sound, Ont. These 

 specimens are silicified, and in many cases deceptive in appearance on 

 account of the apparent smaller diameter and greater distance apart of 

 the corallites. The apparent smallness of the corallites is due to the fact 

 that in some cases the silicious casts only of the tubes remain, which are 

 connected together by horizontal processes. These connections are 

 evidently the casts of the "lateral pores" by which, according to Romin- 

 ger, the contiguous corallites of Cannapora are placed in communication 

 with one another. In a specimen from Owen Sound, a weathered surface 

 presents the appearance of Syringopora jibrata, but on the other side of 

 the same specimen, where the corallites have been less exposed, the true 

 characters of the coral are apparent. On the weathered side compara- 

 tively distant casts of corallites, about *5 mm. in diameter, are seen, 

 whilst on the other side the corallites themselves are shown, about 1 mm. 

 in average diameter, very close together and indistinguishable from speci- 

 mens of Cannapora junciformis from the same locality, in which the more 

 or less annulated tubes, horizontal tabulae and spiniform septa are better 

 preserved. 



Niagara formation. — Lot 13, concession 2, township of Derby, county 

 of Grey, Ont., R. Bell ; and at Owen Sound, Ont., J. Townsend. 1874. 



2. Alcyonaria. 



HALYSITID^l. 



Genus Halysites, Fischer. 1813. 



(Zoognosia, 3rd ed., t. 1, p. 387.) 



Catenipora, Lamarck. 1816. Hist, des An. sans Vert., t. ii., p. 206. 



Corallum reticulate and fasciculate, made up of long, upright, cylindri- 

 cal corallites that are either joined to each other by their edges in a 

 chain like series so as to form vertical, anastomosing laminae inclosing 

 interspaces of variable size, or the laminae are approximated so that their 

 corallites are contiguous or nearly so, while the interspaces are reduced 

 to a minimum ; between each pair of corallites in any particular lamina a 

 tubule is generally present, parallel to and of the same length as the 

 corallites ; tabulae numerous, complete, horizontal, occurring both in the 

 corallites and the tubules; septal spines in twelve longitudinal rows in 

 ths corallites ; a horizontally striated epitheca covers the free sides of the 

 corallites. 



Of the genus Halysites two species are known to occur in Canada, 

 viz., H. catenularia, L. and H. compacta, Rominger. 



