REPORT OF THE DIRECTOR I918 167 



and a number have been recognized and described from the Silurian.^ 

 At least two of the species mentioned in the above reports are present 

 in these cherts, namely Lagena globosa (Montagu) and 

 L. laevis (Montagu). If we attempted to separate the speci- 

 mens from slight modifications in the shell contour we should have 

 one or two additional species but it seems best to include such under 

 synonyms of the principal types. In the Bonaventure chert Lagena 

 is never an abundant fossil and it does not usually show its true 

 lagenine aperture or phialine neck; but there is one cross section 

 on slide 2 which shows such extension and makes more positive the 

 identification of the genus and species. 



It is not at all impossible that the so-called O r b u 1 i n a 

 o V a 1 i s Matthew from the Cambrian of Hanford Brook, St 

 Martin's, New Brunswick, is a Lagena, for existing Orbulinae are, 

 so far as we know, truly globular in cross section even when an 

 internal chamber exists within its outer sphere. Some help in 

 distinguishing these can be obtained, however, from the comparative 

 size of these forms, as Lagenae are minute and the Orbulinae much 

 larger and with larger pores as well as thicker shell. 



We also identify what appears to be Orbulina ovalis 

 Matthew, which is a larger type than Lagena; but, as we can not 

 ascertain the aperture and oral ending, we can not be absolutely 

 positive that the form described by Matthew is present in these 

 cherts. Since there seem to be several Globigerinae similar to 

 those Matthew describes, we believe that O. ovalis is also 

 present. The outline, however, of this shell would be identical 

 with Lagena ovum which Chapman reported from the Upper 

 Cambrian. The significance of the aperture found in Orbulina 

 ovalis Matthew is discussed later under the description of the 

 genus Orbulina. 



Lagena globosa (Montagu) 



Plate 3, figures 8, 9 



Lagena globosa Brady, 1888, Geol. Mag., n. s., Dec. iii, 5: 481-84, 



pi. xiii, figs. 1-3 

 Lagena globosa Vadasz, 1910, Triasforam. aus dem Bakony, p. 17, 



pi. I, fig. II 



The Lagena of above reference, figured by Brady, was from the 

 Silurian of Lower Wenlock age, while those described by Vadasz 

 were from the Trias. 



'Brady, Note on Some Silurian Lagenae. Geol. Mag., n. s., Dec. 3, iJ 

 481-84, pi. xiii. 



