iambe.] CANADIAN PALEOZOIC CORALS. 5 



Favosites prolificus, Billings. 1865. Canadian Naturalist, 2nd series, vol. II. , p. 429 ; 



and 1866, Cat. Sil. Toss, of Anticosti, p. 6. 

 Favosites (?) capax, Billings. 1866. Cat. Sil. Foss. of Anticosti, p. 6. 

 Favosites Niar/arensis, Rominger (non Hall). 1876. Geol. Sur. Mich., Foss. Corals, p. 



22, pi. V., fig. 1. 

 Favosites aspera, Lebedeff. 1892. Obersiluriwche fauna des Timan, p. 8. pi. I., figs. 1, 



a, b, c. 

 Favosites prolificus, Whiteaves. 1895. Palseoz. Foss., vol. III., pt. II., p. 113. 



Corallum massive, attaining to a considerable size, subhemispherical or 

 broadly expanding and agreeing in general external form with Favosites 

 Gothlandica, Lamarck ; upper surface generally convex, under surface as 

 a rule rather flat, protected by an epitheca. Corallites prismatic, with an 

 average width of nearly 2 mm., generally rather equal in the same speci- 

 men. Tabulae complete, horizontal, often concavely or convexly bent, 

 rather close together, generally from '5 to 1 mm. apart but frequently 

 more distant and showing a considerable variation even in the same speci- 

 men. Small marginal pits or depressions in the tabulae are sometimes deve- 

 loped in this species, but as a rule they are small and inconspicuous. Pores 

 of moderate size, placed in or close to the angles of the corallites, in some 

 specimens very numerous and about '75 mm. apart, sometimes encircled 

 by a raised border. Occasionally pores are seen in the sides of the coral- 

 lites, but this seems to be exceptional. Septal spines sharply pointed, as 

 a rule short but capable, as is evinced by some specimens, of a much 

 greater degree of development and becoming moderately long. In this 

 species the septal spines are not so numerous as in the preceding and occur 

 more generally in longitudinal rows. 



The corallites of some specimens are very much below the average 

 width of nearly 2 mm. being less than 1 mm., whilst in other specimens 

 they are very unequal and vary in diameter from about -5 to 2 mm. 



This species occurs in the Hudson River formation in Anticosti and at 

 Stony Mountain, Manitoba, as well as at Stonewall, Manitoba, near the 

 latter place j it is also found in the four divisions of the Anticosti group. 



Specimens of a Favosites have also been collected at East Selkirk and 

 Lower Fort Garry, Manitoba, that are doubtfully referred to this species ; 

 they do not show the pores although otherwise the structure is well 

 preserved. The rocks at these localities have been assigned by Mr. 

 Whiteaves to the Galena-Trenton so that if through the medium of other 

 specimens from these places the pores are found to be situated at the 

 angles of the corallites, the downward extension of the range of Favosites 

 aspera will be considerable. 



The largest specimen in the museum is from Stony Mountain and was 

 collected by R. W. Ells in 1875; it is 10 inches broad, 1\ inches in 



