1899] Lambe — Canadian Paleozoic Corals. 255 



This species is very closely related to if not identical with 

 Zaphrentis Enniskilleni, Milne-Edwards and Haime (Brit. Foss. 

 Corals, p. 170, pi. XXXIV, fig. i) of the Carboniferous limestone 

 of the north-west of Ireland. 



Zaphrentis mirabilis, Billings, sp. 



Amplexus mirabilis, Billings. 1875. Canad. Nat. and Geol., vol. 



VII, 2nd. series, p. 232. 

 Zaphrentis i?ivenusta, Billings. 1875. Ibid, p. 233. 



" Egeria, Billings, pars. 1875. Ibid, p. 234 (the third 



specimen mentioned in the description). 



" subrecta, Billings. 1875 Ibid, p. 235. 



" Leda, Billings. M.S.S. 



Original description. — " Corallum sometimes abruptly 

 curved in different directions, expanding to a width of from 

 fifteen to twenty lines in a length of four or five inches from the 

 base ; above which it becomes more nearly cylindrical. Surface 

 with fine engirdling strise, in general four or five in the width of 

 two lines, but in some places the same number occur in the 

 width of one line. There are also numerous angular rings of 

 growth, distant from two to fifteen lines from each other, with 

 sub-concave spaces between. Septal costae rounded, distinctly 

 defined by sharp striae between them, seven or eight in the width 

 of three lines near the base, and four or five in the same near 

 the calice. There are about forty large septa at the calice, where 

 the diameter is about eighteen lines, with the same number of 

 small ones between them. The larger have a depth of three or 

 four lines and the smaller one line. All of the septa are more 

 or less curved, sometimes very tortuous. The tabulae have not 

 been observed." 



" The above description was drawn up from a specimen, 

 eleven inches in length, measured along all the curves. It is 

 fifteen lines in diameter at fiv3 inches from the base, and about 

 eighteen lines at the cup. The septal costae are very distinctly 

 defined at the base but become more flattened and obscure up- 



