■wards and Haime, Coralliares, v. iii, p. 252) but has smaller tubes. West 

 end ; H. R. J. Richardson. 



The above description is founded on a single specimen, a portion of a 

 large mass, and further observations may render some modification neces- 

 sary. 



Genus Stenopora, Lonsdale. 



Among the fossils from Anticosti there is a great variety of forms belong- 

 ing to this genus. In many instances it is impossible to decide whether a 

 particular form is new, or should be referred to some one of the numerous 

 described species. I shall dispose of the most common as follows provision- 

 aUy. 



S. FIBROSA, Goldfuss. — Occurs throughout the Lower and Middle Silu- 

 rian rocks of Anticosti. 



S. MAMMULATA, D'Orbigny. — Wreck Pomt ; H. R. 



S. PAPILLATA, McCoy. — Incrusting an Orthoceras, at Enghsh Head ; 

 H. R. 



S. EXPLANATA, McCoy. — Occurs at the west end ; H. R. 

 Genus Halysites, Fischer. 



H. Catenulatus, Linnaeus. — Occurs at the west end of the island ; 

 H. R. And also at numerous localities throughout the Anticosti group. 



Genus Petraia, Munster. 



P. angulata, B., Pal. Foss., vol. l,p. 103. — Occurs at Charleton Point 

 and at the west end of the island ; H. R. 



P. selecta, B., Can. Nat. Geol. [2], vol. ii, p. 429. — Base acutely 

 pointed ; above, rather slender for the first few lines, then more rapidly 

 enlarging. Depth of the cup about two-thirds of its width at the maro-in, 

 septal striaB four or five in two lines. The plane of the margin of the cup 

 is, in all the specimens I have seen, very oblique, always inclining towards 

 the concave side. Length of largest specimen seen fifteen lines ; width of 

 cup twelve lines. In general, the individuals are more slender. West end 

 Lighthouse ; H. R. Also at Gamache Bay ; Div. 1, A. G. 



Genus Zaphrentis, Rafinesque. 



Z. AFFiNis, B. op. cit., p. 430. — Three or four inches in length, expand- 

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

 moderately curved, sometimes with strong irregular annulations. In a 

 polished longitudinal section the tabulas are seen to be thin, flexuous, closely 

 crowded together and extending all across or nearly so. There are about 

 two septal striae on the surface in one line, and thus, where the diameter 



