130 Zoological Proceedings of Societies. 



Cardiia arctica of Bruguiere, Byssomya of Cuvier, Saxicava ru- 

 gosa of Lamarck and Turton, and Pholeohiiis of Leach ; tlie same 

 shell having thus in its diiFerent stages of growth, and in its nu- 

 merous irregularities of form, been referred to no less than six 

 genera. Buccinum^ adopting as its type the common B. undatum^ 

 is confined to those species in which the canal is straight ; it is 

 consequently much more limited than the corresponding genus of 

 Lamarck. The fossil species are few in number, and it is re- 

 marked by Mr. Sowerby, that the B. stromboides approaches very 

 nearly to the Cymbia, being distinguished chiefly from that sub- 

 genus of Volutidas by the absence of folds on the columella. But 

 while the genus Buccinum is thus restricted, Nassa becomes pro- 

 portionally extended, as it is made to include not only those 

 species which possess a thickened and callous inner lip, but also 

 those in which the short canal is reflected. In this point of view 

 it exhibits a very striking affinity with Cassis^ one of the species 

 figured, the N. globosa, being scarcely distinguishable from that 

 genus. It also includes the Buccinum reticulatum^ B. Macula, 

 and several other species common on the British Coasts. 



Art. XVI. Proceedings of Learned Societies on subjects 

 connected with Zoologi/. 



ROYAL SOCIETY. 



January 27, 1825. The reading was commenced of a paper 

 On the Anatomy of the MolC'Cricket ; by John Kidd, M.D. F.R.S. 



February 3. — The reading of Dr.Kidd's paper was concluded; 

 and an Appendix to the Croonian Lecture, by Sir E. Home, Bart. 

 V.P.R-S. read, announcing the simultaneous discovery by himself 

 and Mr. Bauer, of nerves in the human navel-string and placenta ; 

 drawings of which by Mr. B. were annexed to the paper. 



February 10. — A paper was read of which the following is a 

 brief abstract : — 



Notice of the Iguanodon, a Fossil Herbivorous Reptile, found 

 in the sandstone of Tilgute Forest; by Gideon Mantell, F.L.S., 

 communicated by Davies Gilbert, Esq. V.P.R.S. 



