Cephalopods. 23 



The exhibitions were :— 



Two Microscopes, with various objects, illustrating the formation of 

 Shells .. .. By the President and Mb. Griffith 



A piece of Lepidodendron, in Coal . . . . . . By Temple. 



Ammonites, Nautili, Belemnltes . . By Mb. Griffith and Eveeabd. 



Mr. Flaywavd read a letter from the Times, respecting the 

 appearance of the November Meteors, as observed by Mr. King- 

 ston, at Toronto, in America. 



A Paper was then read by Everard on 



CEPHALOPODS. 



Of which the following is an abstract. 



The author gave an account of the classification of the Cepha- 

 lopods usually adopted. The great subdivisions being named 

 after the number of the gills Tetrabranchiala and Dibranchinta. 

 These natural groups were also defined by other marks ; those which 

 have four gills being characterised by the absence of an ink-bladder 

 and the presence of an external chambered shell, the chambers of the 

 shell being connected by a tube. Those cephalopods which have 

 two gills have an ink-bladder, and their shell is commonly internal. 

 In the paper nautilus {argonauta) the shell is external. 



The Tetrahranchiata include the nautilus, orthoceras, gonia- 

 tites, ammonites, and many other fossils. 



The Dibranchiata — sepia, soligo, octopus, argonauta, and be- 

 lemnites — the chief fossil representative of this group. 



In the remainder of the paper the author gave a detailed 

 account of the anatomy of the most important species. 



TImrsday, February IStli, 1868. 



The Thirty- eighth Meeting of the Society was held at Mr. 

 Hayward's House. 



The Rev. E. H. Bradby, on leaving Harrow, vacated the 

 office of President. Mr. Hayward consented to supply his place, 



