40 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



end of which is divided from the anterior end of the cavity by a 

 concave border one inch in extent ; the internal border of the in- 

 voluted convexity is also better defined than in Bal. afflnis ; but 

 the overarching wall begins to rise close to it, divided from it only 

 by a deep and narrow rugged fissure instead of by a broad and 

 gently concave tract, as in Bal. definita. 



Both the outer and under surfaces of these specimens are more 

 rounded than in the two preceding species ; but being more muti- 

 lated and water-worn, the characters derivable from the external 

 parts of the bone are of less value. The characters above specified, 

 which are furnished by the involuted convexity, are decisive as to 

 the specific distinction of the present fossils, which therefore indi- 

 cate a third species of extinct whale, which I propose to call Balcena 

 gibbosa. 



There is a fourth form, which differs from the last in the less 

 degree of convexity of the involuted part, but more particularly in 

 its outer border being notched or indented, as in Balcena mysti- 

 cetus, by a vertical angular impression deeper and wider than the 

 smaller vertical fissures. 



The comparative shortness of the involuted convexity distin- 

 guishes this species from the existing Balance and the Bal. affinis, 

 the notched and less convex involution from Bal. gibbosa, and the 

 immediate rising of the overarching wall beyond the inner bound- 

 ary of the involution from the Bal. definita. I propose for this 

 species the name of Balcena emarginata. 



January 3d, 1844. 



Major Thomas Austin, of Bristol, and George Harcourt, Esq., 

 M. P., of Newnham Court, Oxfordshire, were elected Fellows of this 

 Society. 



The following communications were read : — 



1. On the Occurrence of the Genus Physeter {or Sperm Whale) 

 in the Red Crag of Felixstow. By Edward Charlesworth, 

 Esq., F. G. S. 



Some years since, whilst looking over a collection of fossils in the 

 possession of Mr. Brown of Stanway, I was struck by the appear- 

 ance of a cylindrical nodule from the Red Crag of Felixstow, which 

 seemed to me to exhibit indications of an organic structure unlike 

 that of any fossil body which had previously come under my notice. 

 With the permission of its owner I had a section made of this fossil ; 

 but the characters which it presented upon being cut did not en- 

 able me to arrive at any determination respecting its real nature. 



At a subsequent period, I learned from Mr. Brown that the 

 nodule in question had been submitted by Professor Owen to mi- 

 croscopical examination, and identified as the tooth of a Cachalot. 



