"MBE. J CANADIAN PALJ50Z0IC CORALS. 119 



Localities.— At Wreck Point and White Cliff, Anticosti, Hudson River 

 formation, and at Gamache Bay, in division I. of the Anticosti group ; 

 collected by T. C. Weston in 1865. 



The specimens grouped under the name Zaphrentis hellistriata present 

 no characters that would cause the writer to think otherwise than that 

 they are rather small and in some cases very young specimens of Z. affinis ; 

 the largest specimen, 4 inches in length, (labelled Wreck Point, Anticosti, 

 and mentioned in the original description) is crushed laterally, the tabulae 

 are broken and the calyx is distorted. The type specimens of .^. hellistri- 

 ata were collected at Wreck Point, Anticosti, in the Hudson River for- 

 mation, and in division I. of the Anticosti group, also at 1 mile east of 

 Otter River, Anticosti, as well as at other localities in division II. of the 

 Anticosti group ; J. Richardson and T. C. Weston, collectors. 



Zaphrentis patens, Billings. 



Plate VIII., figs. 2, 2a. 



Zaphrentis patens, Billings. 1865. Canadian Naturalist, new series, vol. II., p. 430. 

 II M Billings. 1866. Cat. Sil. Foss. of Anticosti, p. 33. 



Corallum simple, with a shallow widely expanding calyx whose mar- 

 gins slope gently upward or become horizontal near the periphery and are 

 marked by converging septa that do not meet, but leave a broad smooth 

 surface at the centre. Septa of two sizes, primaries and secondaries al- 

 ternating, and numbering in all about seventy-two, of which the former, as 

 seen in a natural transverse section about 10 mm. beneath the bottom of 

 the cup, pass a little more than half way to the centre as carinations on 

 the tabulse, whilst the secondaries are little more than thin ridges on the 

 inside of the wall. On the margins of the calyx the primaries appear as 

 sharp-edged raised plications, with the secondaries between them as 

 uniserial rows of denticles. Tabulse, as seen in a radial vertical section, 

 complete, regular, 1 or less than 1 mm. apart, extending from one side of 

 the corallum to the other, concave, flat at the centre, suddenly bent down 

 at the edge ; the flat, central, smooth part not encroached on by the septa 

 is about one-third of their breadth. Fossette deep, narrow, placed atone 

 side of the calyx and occupied by a primary septum. 



The measurements of the type specimen as already given in the original 

 description are as follows : — " The specimen is broken off at nine lines 

 below the margin of the cup. Diameter of the lower extremity, twenty- 

 one lines, and of the cup at the margin, thirty-three lines. It thus 

 expands, in this part, one inch in a length of nine lines. It may have 

 been more cylindrical below. In the cup there are thirty-six large septa 



