430 THE CANADIAN NATURALIST. [Dec. 



and a-half in diameter at the margin of the cup. The other is 

 ten lines in length and seven in diameter. There are about sixty 

 septa in each. In a polished longitudinal section, the cup is found 

 to extend about half the length of the whole fossil downwards and 

 to have a conical elevation in the centre. The septa, above the 

 bottom of the cup extend inwards about one line gradually 

 diminishing in height to the margin. Junction Cliff and White 

 Oliff, Anticosti ; Division 1 ; Anticosti group ; Middle Silurian. 



Genus Zaphrentis, Rafinesque. 



Z. patens. — 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 nearly three lines apart at the margin. Between these 

 are thirty-six smaller ones, which are scarcely half a line in height, 

 and have their edges serrated with small denticulations about 

 three in one line. There is a deep septal fossette on one side. 

 Surface and lower parts unknown. Cormorant Point, Anticosti; 

 Division 3 ; Anticosti group ; Middle Silurian. J. Richardson. 



Z. affinis. — Three or four inches in length, expanding to a 

 diameter of eighteen lines at the height of three and a half inches, 

 moderately curved, sometimes with strong irregular annulations. 

 In a polished longitudinal section the tabulae are seen to be thin 

 flexuous, closely crowded together and extending all across or 

 nearly so. There are about two septal striee on the surface in one 

 line, and thus, where the diameter is eighteen lines there must be, 

 at the margin, about one hundred septa. In part of a weathered 

 cup some of the septa run along the upper surface of the tabulae 

 nearly to the centre. This species is allied to Z. Canadensis, but 

 differs in having the principal septa more developed and in its 

 more irregular growth. The cup has not been seen. It is 

 possible that this and Z. Canadensis may belong to a different 

 genus, perhaps to Ompliyma. Wreck Point and White Cliff, 

 Anticosti. In the Hudson River group and in Division 1 ; 

 Anticosti group; Middle Silurian. T. C. Weston. 



Z. bellistriata. — Turbinate, gradually enlarging from an 

 acutely pointed base, moderately and sometimes irregularly curved. 

 There are about sixty septa where the diameter is one inch. 

 Many of these, in the lower part, reach the centre, but above 



