tAMBE. ] CANADIAN PALEOZOIC CORALS. 63 



Cannapora junciformis, Hal). 



Cannapora junciformis, Hall. 1852. Palseon. New York, vol. 11, p. 43, pi. XVIII., 



figs. la—/. 

 Cannapora annulata, Nicholson and Hinde. 1874. Canadian Journal, new series, vol. 

 XIV., p. 154. 

 ii ii Nicholson. 1875. Palseon. of Ont., p. 58. 



Syrinyopora junciformis, Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 85, pi. 



XXXIII. , fig. 4. 

 Syrinrjopora fibrata, Rominger. 1876. Ibid, p. 81, pi. XXX., fig. 3. 



The original description and figures of this species and the general 

 characters assigned to the genus, of which this species is the type, are 

 necessarily imperfect on account of the poor state of preservation of the 

 specimens primarily at Professor Hall's disposal. 



The Niagara rocks of Ontario have yielded specimens in which the 

 general form of growth is seen to better advantage and the inner structure 

 is more clearly defined. A certain amount of variation, often accentuated 

 by the state of preservation of the fossils, is noticeable in the size of the 

 corallites and in the surface markings. 



In this species the corallites are very close together, parallel, nearly 

 straight, and annulated by more or less well defined sharp-edged ridges 

 which are prolonged at intervals and serve as a means of connection be- 

 tween contiguous corallites. The base evidently adhered to foreign 

 objects and is made up of an aggregation of close-set, prostrate corallites, 

 diverging from one or more centres and forming a crust from which the 

 corallites at regular intervals grew erect. This basal lamellar expansion 

 is formed on the same principal as that of some species of Syringopora. 

 Corallites from about 0*75 to 2 mm. in diameter in different specimens. 

 Tabulae rather regular in disposition, horizontal, close set. Septa spini- 

 form, occurring in about twelve longitudinal rows. 



The corallites in the specimens available for study in this museum 

 show a decided variation in the amount of development of the annulations 

 as well as in the size of the corallites themselves. One example from the 

 vicinity of Owen Sound, Ont., bears a strong resemblance to the specimen 

 figured by Hall (op. cit. pi. XVIII., fig. lb) in having comparatively 

 smooth tubes, another from the same locality, with strongly annulated 

 corallites, agrees more with the form described by Nicholson and Hinde 

 under the specific name annulata but which is^ in the writer's judgment, 

 not separable from Hall's species, or at the most could only be regarded 

 as a variety. 



Springopora fibrata, Rominger (op. cit.) from the Niagara of Drum- 

 mond Island, Lake Huron, seems to belong to this species, and is 

 represented, in the museum collection, by some specimens from this 



