33 



tant from one-fourth to one-half their diameter. Cost^e forming a fringe 

 around the apertures and also seen in vertical polished sections. Intercel- 

 lular tissue composed principally of thin, undulating or flat horizontal dia- 

 phragms extending from tube to tube and subdivided into square cells by 

 the costae at the surface of the walls. Tabulae obscurely seen, in the 

 specimens observed, apparently very thin. There are about three dia- 

 phragms and tabular in one Hne. The radiating septa form thin, sharp, 

 strong, elevated striae on the inside of the tubes where exposed in weathered 

 specimens. West side of Gamache Bay; Div. 1, A. G.* T. C. Weston. 



Genus Alveolites, Lamarck. 



A. Labechei, Edwards and Haime. — Occurs abundantly at South-west 

 Point and the Jumpers ; Div. 4, A. G. 



Genus Petraia, Munster. 



P. SELECTA, B., (ante, p. 7.) — Gamache Bay ; Div. 1, A. G. Also in 

 the H. R. 



P. PULCHELLA, B., op. cit., p. 424. — The two specimens on which this 

 species is founded are acutely pointed and moderately curved. The fol- 

 lowing are their dimensions. One of them is nine lines in length and six 

 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 margm. Junction Cliflf and 

 White Cliff; Div. 1, A. G. 



P. PYGMEA, B., Pal. Foss,, vol. i, p. 103. — Challoupe River ; Div. 4, 

 A. G. 



P. LATUSCULA, B., op. cit., p. 104. — Walls Cove, East Point, and the 

 Jumpers ; Div. 2, 3, 4, A. G. 



Genus Zaphrentis, Rafinesque. 



Z. patens, B., Can. Nat. Geol., [2,] vol. ii, p. 430. — The specimen is 

 broken off at nine Unes 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 



* This species appears to be congeneric with Si/ringopkyllum organum — Sarcinula 

 organum. Should this view turn out to be correct, then the generic name must, of 

 course, be changed. 



