﻿162 Proceedings of the Royal Physical Society. 



It should be mentioned that in 1860 J. W. Salter noticed 

 a large foliaceous flattened species of Stenopora among a few 

 Permian fossils brought home from Spitsbergen by J. Lament 

 in 1859;! but unfortunately no description is given of that 

 species, other than the indication that it is foliaceous and 

 flattened. 



Cryptostomata. 



Fenestella, Lonsdale. 



Fenestella cf. retiformis (Schlotheim). 



Fragments of a Fenestella occur here in immense number, 

 but, as is usually the case with Fenestellids, the obverse face 

 is in all specimens so firmly embedded in the matrix, that 

 the presence and nature of the dividing ridge could not be 

 observed. It was likewise impossible to obtain a complete 

 frond, so that the specific determination is rather uncertain. 

 As, however, the shape of the branches and fenestrules, and 

 the distribution of the cells, correspond very well to what 

 obtains in F. retiformis (Schloth.), I identify the present 

 specimens with it, pending further examination on more 

 suitable material. 



POLYPORA, M'Coy. 



Polypora is quite as abundantly represented as Fenestella, 

 as regards number of specimens; but it is not possible to 

 state whether more than one species is present, as no speci- 

 men of an entire frond is in the collection. The stronger 

 and better preserved fragments, belonging to a frond which 

 was apparently infundibuliform in shape, are composed of 

 branches 1 mm. thick, longitudinally striated on the reverse 

 side and finely granulose on the obverse side. Fenestrules 

 elongate, four in the space of 1 cm. in the longitudinal 

 direction, five or six within the same distance in the trans- 

 verse direction. Seen from the reverse side, the fenestrules 

 are not so elongate, and appear wider. Cell apertures in 

 three alternating rows, with projecting margins. About 

 thirty such apertures occur within the space of 1 cm. 



1 Quart. Jour. Geol. Soc, 1860, p. 441. 



