EORAMINIEERA OF NORTHUMBERLAND AND DTEHAM. 83 



as it were, a distinct group in the Permian life-system, they are 

 yet, on the one hand, connected with those of earlier Permian 

 date by Ulmannia selaginoides, and probably by the Acrolepis 

 and the Palceoniscus I have referred to P. angmtus, which occur 

 either in the Marl-slate of Durham or the Brandschiefer of 

 Saxony ; and, on the other hand, they would appear to be con- 

 nected with the Triassic life -groups by the Calamite referred to 

 C. arenaceus. Should the identification in this case prove correct, 

 we then shall have at least a connecting link of species between 

 the life-systems of the Palseozoic and Mesozoic eras. It would 

 be premature, however, as yet distinctly to assert that such a 

 connecting link exists ; for though the tendency of the evidence 

 that may be deduced from the fragments of the Calamite dis- 

 covered may be in that direction, the evidence is, nevertheless, 

 too imperfect to allow the decision to be clear of doubt. 



EXPLANATION OF PLATE IX. 



Fig. 1. Palseoniscus altus, Kirkby. Natural size. Old Quarry, Fulwell 



Hill. 

 Fig. 2. Palseoniscus varians, Kirkby. Natural size. New Quarry, Fulwell 



Hill. 

 Fig. 3. Palseoniscus Abbsii, Kirkby. a, anterior portion ; b, posterior portion 



of the same fish. Natural size. Old Quarry, Fulwell Hill. 



V. — A Catalogue of the Recent Foraminifera of Northumberland 

 and Pur ham. By Henry B. Beady, E.L.S., F.G.S. 

 (Plate XII.) 



The interest associated with that portion of the animal kingdom 

 to which the Foraminifera belong has been much augmented of 

 late years with the increased employment of the microscope as a 

 means of research, and its extended use as a source of intellectual 

 amusement. The publication, by the Pay Society, in 1858, of 

 Professor "Williamson's work on the Pecent Foraminifera of Great 

 Britain, and of Dr. Carpenter's philosophical "Introduction," in 



