124 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



ward nearly to the centre. One specimen has a diameter of eighteen lines 

 and another sixteen lines. 



" A third specimen is only twelve lines in diameter, with the same 

 characters as the last two. 



" The materials are not sufficient to enable us to decide positively 

 whether they all belong to the same species or not. Should there be 

 more than one species, the specific name above given ought to be retained 

 for the larger form first above described." (Billings.) 



Locality. — Indian Cove, Gasp^, Que., in the Gaspd limestone No. 8, 

 stated by E. Billings to be nearly of the age of the Oriskany sandstone ; 

 collected by R. Bell in 1862. 



The typical form of this species appearb to be more slender than Z. 

 gigantea, of a higher geological horizon, and differs from it principally in 

 having shorter and rather fewer primary septa and more irregularly dis- 

 posed tabulae, as well as in having a more pronounced curve at the base. In 

 the type specimen of Z. incondita there are one hundred and twenty-five 

 septa, alternately long and short, seen in a transverse section four and a 

 half inches above the basal end, as measured along the convex curve ; in 

 this section four or five of the septa are observed to extend inward almost 

 to the centre of the corallum. 



Zaphrentis cingulosa, Billings. 



Plate YIII., figs. 5, 5a, 56. 



Zaphrentis sp. undetermined, Billings. 1863. Geology of Canada, p. 439. 

 Zaphrentis cimjulosa, Billings. 1874. Palseo^. Fobs., vol. II., pt. I, p. 10, pi. I., fig. 5. 



Corallum simple, cylindrical, slender, curved below to a radius 

 of between 7 and 8 cent., straight above, legularly annulated by strong 

 distant ridge-like expansions. The only specimen representing the species 

 is imperfect at both ends and is distorted by lateral compression ; its 

 length along the convex curve is over 17 cent., its breadth below about 3 

 cent., with little or no increase in size above, and the average distance 

 apart of the ribs is about 17 mm. Epitheca cancellated by longitudinal 

 septal furrows and almost as distinct transverse growth lines. The cor- 

 allum consists of a succession of invaginated, inverted, truncated cones, 

 the result of periodic expansions, representing arrests of growth and 

 former calyces, from within each of which the renewed growth of the 

 corallum in turn began. Septa well developed, forming by the union of 

 their outer ends a strong wall from which the primaries and secondaries 

 extend inward in alternating order a distance of 5 or 6 mm. and 2 or 3 

 mm. respectively, numbering in all about sixty-four. Tabulse, very much 



