lambe.] CANADIAN PALEOZOIC CORALS. 71 



specimen was obtained from rocks of Lower Helderberg age, near the 

 mouth of the Little Cascapedia River, Que. ; it is preserved in limestone 

 and there is no evidence of tubules being present ; what appear to be 

 septal spines are indistinctly seen. 



Halysites catenularia, var. amplitubulata. (Var. nov.) 



Plate IV., figs. 4, 4a. 



This might rightly be considered the most striking of the varieties of 

 this species ; in it the tubules are found to be as large as and even 

 larger than the corallites themselves. It occurs in the Lower Helder- 

 berg rocks of l'Anse a la Barbe and l'Anse au Gascon, Que. Only portions 

 of different coralla were collected, so that it is difficult to make out 

 exactly its general form of growth, although it appears to be rather 

 spreading. The details of structure are stated in the accompanying 

 table and the figures will give an idea of the great development of the 

 tubules. Septa have not been seen. The tabulae of the tubules are 

 noticeably coalescent ; they are close set, concave at the centre and 

 abruptly bent down at the edges. The corallites are almost circular and 

 their tabulae are comparatively regular and distant. 



Halysites catenularia, var. nitida. (Var. nov.) 



Plate IV., figs. 2a, 26. 



A number of specimens, sometimes in masses 6 inches and more 

 across, from the Lower Helderberg rocks found at l'Anse a la Barbe and 

 vicinity, Baie des Chaleurs and Neigette Falls, near Rimouski, Que., 

 represent this variety in the collection. The meshes made by the coral- 

 lites are small ; the corallites themselves are small, oval in section and 

 separated by moderately narrow tubules ; in longitudinal sections the 

 compactness and regularity of the tabulation of both the corallites and 

 tubules is noticeable. Septal spines are present. 



Halysites com pacta, Rominger. 

 Plate IV., figs. 5, 5a, 6, 7 and 8, 8a. 



Halysites compactus, Rominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 78, plate 



XXIX., fig. 3. 



Whiteaves. 1884. Palaeoz. Foss., vol. III., pt. I., p. 2. 

 Halysites agglomeratus var. compactus, Whiteaves. 1895. Ibid, vol. III., pt. 

 II., p. 48. 



