256 Proceedings of the Royal Physical Society. 



and North Somerset). They are not all from the same layer, but judging 

 from the materials at hand, and from the descriptions given by Jamieson, 

 the most fossiliferous bed is a markedly foetid limestone, greyish-brown, 

 hard and compact. A dark fine-grained limestone is also very fossiliferous, 

 and contains an assemblage of species apparently coeval with those of the 

 foetid limestone. There are besides a few slabs of sandstone containing 

 fossils the age of which is doubtful. Of these, mention may be made 

 here of bodies referable to castings of various organisms ; some suggest 

 worm-castings of " Arthrophycus " type, while others, large and massive, 

 cannot yet be assigned to their proper systematic position. 



CGELENTEBATA 



Stromatoporids. 



Several flattened masses, lighter in hue than the matrix, suggest the 

 presence of Stromatoporids. But if they indeed are Stromatoporids no 

 more precise description can be given, since the microscopical structure 

 is completely obliterated by infiltrated matter. 



These bodies occur in the foetid limestone. 



Anthozoa. 



Favosites sp. [cf. F. helderbergice Hall]. 



1887. Favosites helderbergice, Hall, Pal. New York, vol. vi. p. 8, pis. 4-6. 



1909. Favosites lielderberyice, Clarke, 62nd Ann. Report N.Y. State Museum, p. 49. 



Several specimens of a Favosites appear undistinguishable from Hall's 

 species — the mode of growth, the size of the corallites and the distribution 

 of the tabulae being identical. Besides, they offer a diagnostic character 

 emphasised by Dr Clarke, viz. the extreme reduction in the size and 

 number of the septal spines, which appear absent in the sections made. 

 As the specimens are still sufficiently well preserved to show the mural 

 pores, it would seem that the absence of septal spines is not altogether 

 due to the mode of preservation, and points to identity with F. helderbergice 

 rather than with the closely allied species F. niagarensis Hall. 



Preserved in the foetid limestone. 



Favosites sp. 



This is probably a new species, but the single specimen at hand is so 

 badly preserved that a satisfactory description cannot be given. The 

 characteristic feature resides in the mode of growth, the colony being 

 blade-like, narrow and lanceolate. When complete it exceeded 19 cm. 

 in length, while its width is 15 mm. and its thickness 3 mm. only. The 



