REPORT OF THE DIRECTOR I918 I9I 



we should hesitate to identify the genus in such an early occurrence ; 

 but there can be little doubt as to the correct generic type, although 

 we are not so sure about the specific identification. This species 

 seems to accord more closely with R. orbicularis than any 

 other published form, but the margin is much more symmetrical 

 and not so lobate as some figures of the species. The specimen 

 consists of eighteen or pDSsibly nineteen chambers, the last one 

 broken away; and there are ten chambers in the last convolution 

 and three volutions in all. The diameter is 0.013 mm, maximum 

 width. 



Rotalia orbicularis must not be confused with D i s c o r - 

 bin a orbicularis known from the Trias and later horizons. 

 By Parker & Jones, R. orbicularis is considered a variety of 

 Rotalia beccarii (Linne) , but it is best to keep the two 

 distinct. It occurs today in the North Atlantic and Arctic oceans 

 and Parker & Jones describe the species as follows:^ "This extremely 

 delicate and minute abyssal variety of R. beccarii is but 

 little removed from R. soldanii; but it is smaller, and has 

 its upper face still flatter and smoother than in R. soldanii. 

 It is in shape half an oblate spheroid, having the upper side fiat, 

 the lower forming a low rounded cone." 



Fossil specimens have been recorded from the London Clays 

 and the Eocene of Paris, and it seems to be widely distributed in 

 the Tertiary. The genus Rotalia is reported from Silurian strata 

 in the Llandovery beds but it does not seem to be at all common 

 until the Mesozoic. 



List of Foraminifera Identified in the Bonaventure Cherts of 



New Brunswick 



1 Anomalina grosserugosa (Gumbel) 



2 Bolivina dilatata Reuss 



3 " punctata d'Orbigny 



4 ' ' reticulata Hantken 



5 Bulimina pupoides d'Orbigny 



6 " pyrula d'Orbigny 



7 Cristellaria acutauricularis {Fichtel & Moll) 



8 " gibba d'Orbigny 



9 Discorbina orbicularis {d'Orbigny) 



^Phil. Trans., 1865, p. 389 



